Really Simple SSL Pro - WordPress Plugin

How to Configure Really Simple SSL Pro for a Secure WordPress Site

Really Simple SSL Pro is best understood not as a simple "turn on HTTPS" button, but as a practical security workspace for a WordPress site, where SSL migration, login protection, hardening, security headers, firewall rules, and vulnerability monitoring all come together in one clear process. In this guide, we will walk through how to approach the plugin after installation: what to check before enabling features, which settings to turn on first, where to move carefully, how to verify the results, and what to do if part of the protection interferes with normal site behavior.

This guide is written for site owners, WordPress administrators, and developers who need to get a site under control quickly without randomly flipping every switch they see. The plugin really does make many tasks easier, but security is not reduced to a single settings screen. It matters which features change the login flow, which ones write rules into the server configuration, which affect external requests, and which only provide diagnostic signals.

Below, we will follow a practical workflow: install the plugin and perform an initial review, enable HTTPS and the mixed content scan, configure basic hardening measures, carefully turn on security headers, protect logins with 2FA or passkeys, enable the firewall and vulnerability measures, and then test the site both as a regular visitor and as an administrator. We will also cover common issues separately: mixed content, redirect loops, cURL errors, 404 blocking, administrator lockouts, and conflicts with another security plugin.

What the plugin does and where it is more useful than a basic SSL toggle

The name Really Simple SSL Pro is historically tied to moving a site to HTTPS, but the official product has evolved into Really Simple Security Pro. That matters when reading the interface: in the WordPress admin area and official documentation, you may see the name Really Simple Security, while the product page, the ZIP archive, or older reviews may still refer to Really Simple SSL Pro. For the user, the meaning is the same: the plugin helps move a site into a secure HTTPS setup and address a range of common WordPress weak points.

The core job of the product is not to replace the administrator or promise absolute protection. It helps make routine security tasks visible and manageable: configure HTTP-to-HTTPS redirects, validate the certificate, detect mixed content, apply hardening recommendations, add security headers, protect logins, enable firewall rules, and receive alerts about known vulnerabilities in site components.

The practical value is especially noticeable on sites where security used to be a collection of separate tools: one plugin handled SSL, another handled logins, a third managed headers, and a fourth sent vulnerability alerts. That setup can work, but it becomes harder for the administrator to understand what is already enabled, where features overlap, and why the admin area stopped opening after one more toggle was switched on. Really Simple SSL Pro tries to bring those jobs into a single workflow with a dashboard, onboarding, and separate settings tabs.

Key areas of protection

Based on confirmed sources, the plugin covers several major areas. First, SSL and HTTPS: redirects, secure cookies, SSL Health Check, and mixed content. Second, WordPress hardening: disabling risky capabilities, protecting files, controlling usernames and settings that often become entry points for automated attacks. Third, login protection: 2FA, TOTP, email verification, passkeys, password security, Limit Login Attempts, and CAPTCHA after failed logins. Fourth, firewall features: 404 blocking, geolocation-based restrictions, blocklist, allowlist, and event log. Fifth, vulnerability detection and vulnerability measures, which help identify known issues in the WordPress core, themes, and plugins.

On a live site, these are not five separate checkboxes, but a chain. If you enable only HTTPS, you protect data in transit, but weak passwords remain a problem. If you enable only 2FA, the site may still have problematic headers or a vulnerable plugin. If you enable the firewall without checking 404 errors on the homepage, you may end up with false blocks. That is why it is better to configure the plugin using one simple rule: enable a feature, then test the frontend, the admin area, the login flow, and the event log.

Who it fits, and when another approach may be better

The plugin is a strong fit for small to mid-sized sites, blogs, corporate websites, directories, landing pages, small stores, and client WordPress projects that need a clear center for baseline security without heavy manual configuration. It is also convenient for administrators who previously used the free version for SSL and now want to add login protection, headers, firewall features, and vulnerability measures within the same overall workflow.

Really Simple SSL Pro may not be the best first choice if the site is already managed by a dedicated security team, uses a complex cloud WAF, relies on custom authentication, has an unusual reverse proxy setup, or follows corporate server-level security rules. In those cases, some plugin features may duplicate existing protection. The official FAQ explicitly warns about overlap with Wordfence: if both tools are in use, similar modules should not be enabled twice.

Working rule: each type of protection should have a single owner. If the firewall, 2FA, security headers, or redirects are already configured at the server, CDN, or another plugin level, decide first where the primary source of rules will live, and only then enable the matching module in Really Simple SSL Pro.

What to check before installation and initial activation

Before installing a security plugin, do not go hunting for the "best settings" blindly. First, prepare a rollback point. Really Simple SSL Pro can change redirects, headers, login rules, and the behavior of certain requests. Most features are reversible, but if you enable several protections at once and then run into a login error or a caching conflict, finding the cause becomes much harder.

Minimum site preparation

Start with a backup of both the files and the database. This is not just a formality: SSL redirects and hardening can affect .htaccess, wp-config.php, cookie behavior, and how resources load. If the site runs on NGINX, LiteSpeed, managed hosting, or a CDN, verify where HTTPS redirects and security headers are actually controlled. When the same header or redirect is set in two places, the browser may receive conflicting results.

• Confirm that the site opens over HTTPS manually, even if the automatic redirect is not enabled yet.
• Update WordPress, the theme, and active plugins to supported versions if you can do so safely without a separate release cycle.
• Make sure you have access to hosting, a file manager, FTP/SFTP, or the control panel so you can remove a login block if 2FA or firewall rules cause an issue.
• Document which security plugins are already installed and which features are enabled in them.
• Remove unnecessary plugins that have not been used in a long time, because vulnerability detection can show the risk, but it does not make old code safe by itself.

Special cases: cache, CDN, multisite, and custom login flows

If the site runs behind Cloudflare, another CDN, or a reverse proxy, check the SSL mode, the X-Forwarded-Proto headers, and cache rules. Redirect loops often appear not because the plugin "broke" the site, but because WordPress, the server, and the CDN disagree about which protocol the visitor is using. For stores and membership sites, also test the login page, account page, cart, and checkout, because that is where cookie problems, CAPTCHA issues, 2FA, and IP blocking tend to show up first.

For WordPress Multisite, the approach should be even more careful. The official plugin listing notes that the product includes network settings, and the agency plan includes a separate multisite plugin. But on a real network, the impact of redirects, 2FA, and firewall rules is broader: one mistake can affect multiple sites. For that reason, with multisite you should test settings on a staging copy or on one non-critical site in the network first, and only then roll the rules out to the others.

Installation and initial review without risky jumps

Really Simple SSL Pro installs like a standard WordPress ZIP plugin: through Plugins - Add New - Upload Plugin. This guide does not cover purchasing, payment, obtaining a license key, or account management. For a working setup, something else matters more: after activation, do not enable every recommendation at once. First, understand the current state of the site from the dashboard and go through a basic review.

In current versions, the Pro plugin works as a standalone product, so you generally do not need to keep the old free version installed alongside it. If you see a dependency notice or a message about an old version after installation, check whether the previous free plugin is still present on the site next to Pro. The official instructions state that once the old version is removed and Pro is updated, the problem should disappear.

First visit to the Security panel

After activation, look for the panel in the WordPress admin area under the path the documentation describes as Settings - Security. The interface usually includes a dashboard, progress, status, vulnerabilities, task links, and a Settings tab. Do not dismiss this screen as marketing-style onboarding. It shows which tasks are still open, which features are already active, and where warnings remain.

The initial review should consist of three steps. First, check whether SSL is active and whether there is any warning about the certificate. Then run SSL Health Check or verify the site with external SSL Labs if you want independent confirmation. After that, open the public site in a private browser window and test several page types: the homepage, a blog post, a page with a form, a page with images, and the login page.

How to tell whether HTTPS is enabled correctly

A correct result is not limited to a green status on the dashboard. Verify that requests to http:// are redirected to https:// with a permanent redirect, that the WordPress Address and Site Address in the general settings do not conflict, that images, CSS, and JS are not loading over HTTP, and that forms and account areas keep cookies after login.

If the site uses a caching plugin, clear the cache after enabling SSL and redirects. The project changelog includes fixes related to clearing the Cloudflare cache after SSL activation and handling .htaccess, so you should not diagnose stale cache as a current plugin bug. Clear the WordPress cache, CDN cache, and server cache first, then repeat the test in a private window.

SSL, mixed content, and security headers: the setup you can actually verify in the browser

The most straightforward part of Really Simple SSL Pro is the move to HTTPS. But this is also where false conclusions often appear: the administrator sees that the site opens over HTTPS and assumes the job is done, while the browser is still blocking some resources or marking the page as insecure. That is why, after enabling SSL, you should work through three levels of validation: mixed content, SSL Health Check, and security headers.

Mixed Content Scan & Fixer

Mixed content happens when the HTML page loads over HTTPS, but some resources are still requested over HTTP. This is usually caused by old links to images, CSS, JS, fonts, background images in stylesheets, third-party service widgets, or data saved inside theme settings. The official documentation specifically notes that many mixed content cases are tied to URLs inside CSS or JS files.

The Pro version includes an advanced mixed content scan and fixer. In a practical workflow, run the scan after activating SSL, then fix the issues in order of risk. If the problem is in page content, it is better to replace the URL in the editor, database, or theme settings. If the issue is in CSS or JS, find the source file first: the theme, child theme, page builder, caching plugin, or third-party widget. The automatic fixer is useful as a temporary safety net, but the best result comes from fixing the source URL itself, not from endlessly rewriting output at runtime.

How to verify the result after a mixed content scan

1. Open the page in a private browser window.
2. Open Developer Tools and go to the Console tab.
3. Check for warnings about loading http:// resources.
4. Go to the Network tab and filter requests by http:.
5. Clear the cache and test again if the old URLs are gone in the editor but still appear in the browser.

SSL Health Check and external validation

SSL Health Check in the dashboard performs SSL/TLS validation and helps identify issues with the certificate, chain of trust, protocols, and the server's baseline configuration. If the grade is unexpectedly low, do not enable HSTS Preload in an attempt to "silence" the warning. HSTS strengthens the HTTPS requirement, but it does not fix the certificate or repair the server certificate chain. If there is a certificate issue, work with the host or review the Let's Encrypt configuration first, then return to stricter headers.

For an important site, it is useful to compare the result with an external SSL Labs test. This is especially relevant after a move to new hosting, a CDN change, or new TLS settings. If the dashboard and the external test disagree, make note of exactly which URL was checked: with www or without, through the CDN or directly, on a subdomain or the primary domain.

Security Headers and HSTS without unnecessary risk

Security headers protect visitors at the browser level. Really Simple SSL Pro includes HSTS, HSTS Preload, Frame Ancestors, X-Frame-Options, X-Content-Type-Options, Referrer Policy, CORS, and a WordPress-tailored Content Security Policy. The best way to configure them is not by clicking "maximum strictness" in one shot, but by moving from the safest and most predictable headers toward the more sensitive ones.

Start by checking the recommended headers with the built-in scan or an external developer scanner. Then enable the baseline headers and test the site: forms, authentication, embedded maps, payment widgets, YouTube embeds, CDN resources, fonts, analytics scripts, and iframes, if they are actually needed. The most cautious approach is required for CSP and HSTS Preload. CSP can block third-party scripts and styles, while HSTS Preload is not something you can instantly roll back, because browsers and the preload list remember the policy.

WordPress hardening: which measures to enable first

Hardening in Really Simple SSL Pro is a set of settings designed to reduce the WordPress attack surface. Official sources mention prevention of code execution in uploads, disable XML-RPC, disable directory browsing, prevent login feedback, disable user enumeration, username restrictions, custom login URL, automated file permissions check and fixer, database prefix changes, debug.log relocation, disabling application passwords, admin creation control, and HTTP methods restrictions. But these measures do not all carry the same level of risk or reversibility.

To avoid breaking the site, divide hardening into three groups: measures that are almost always useful, measures that should be enabled only after compatibility testing, and measures that should be used only when there is a clear need. That approach is better than turning on every option because the security score looks impressive.

Measures that are almost always useful

The first group includes disable directory browsing, protection against PHP execution in uploads, restricted login feedback, user enumeration protection, and file permissions checks. These features usually do not change the site's user-facing flow, but they close off common technical weaknesses and signals that automated scanners rely on. After enabling them, test media uploads, upload forms, image handling, and any admin action that writes files.

If the file permissions fixer proposes changes, do not apply them blindly on non-standard hosting. Compare them with your host's recommendations first. On shared hosting, managed WordPress platforms, and container-based infrastructure, permissions may differ from the classic setup. Fixing file permissions should still allow WordPress to update itself and upload media, otherwise you may trade a dashboard warning for a much worse operational problem.

Measures that require scenario testing

Disable XML-RPC is useful if the site does not rely on older mobile apps, Jetpack workflows, or external integrations that still need XML-RPC. Disable application passwords increases control over external access, but it can interfere with REST API integrations, mobile editors, and automation services. A custom login URL can reduce the noise from automated login attempts, but it requires discipline: save the new address in a secure password manager and verify how it affects SSO, WooCommerce, a membership plugin, or client instructions.

Database prefix changes and debug.log relocation can both make sense, but they require care. It is best to change the table prefix only after creating a backup and only when the site is not actively processing work. The debug log should be moved out of any public area if it is enabled and could expose paths, requests, or errors. But if the site is under active development, coordinate with the developer so everyone knows where the log should be checked going forward.

What not to do just to chase a prettier score

Do not enable HTTP methods restrictions, region restrictions, or strict login rules just because they look "more secure." The site may have a REST API, webhooks, payment callbacks, external integrations, a CRM, a mail service, or a mobile app. If you do not yet know which methods and regions real users actually need, start with logging and observation first, then introduce restrictions.

Good hardening should not turn the site into a sealed vault that the site's own editors, clients, and services can no longer access. The goal is to remove unnecessary entry points, not to block legitimate workflows.

Login protection: 2FA, passkeys, passwords, and Limit Login Attempts

Login protection is one of the most product-specific areas of Really Simple SSL Pro. The official documentation covers 2FA, email verification, TOTP, passkeys, password security, compromised password checks, frequent password changes, session duration, Limit Login Attempts, CAPTCHA after failed logins, and user status management. This is where it is especially important not to confuse security with inconvenience: if you force strict login requirements on everyone without preparation, you will create support requests and risk locking out administrators.

How to choose the login method by role

For administrators and editors, TOTP or passkeys are the better options. The documentation explicitly recommends TOTP for administrators because the code is generated on a separate device. Email verification is easier, but its security depends on the mailbox. If the email account is compromised or delivery is delayed, that second factor becomes weaker. Passkeys are convenient because they replace the password with a device, biometrics, or a security key, but they require a compatible browser and a user base that is comfortable with them.

The setup path in the documentation is described as Security - Settings - Login Protection - Login Authentication. There, you can enable Two-Factor Authentication, choose which roles must use 2FA or passkeys, allow specific methods, and assign a grace period. The grace period should not be too short for an editorial team: people need time to configure the login method, download backup codes, and understand what the next login will look like.

A practical setup for a typical site

• For Administrator, require TOTP or passkeys.
• For Editor, enable 2FA after a short test with one user first.
• For Author and Contributor, start with optional 2FA if the team is large.
• For WooCommerce customer roles, do not enforce strict 2FA until you have tested checkout, account access, and recovery flows.
• Document an emergency access procedure before you require protection for all administrators.

Password Security and sessions

Password Security is useful anywhere there are many users: editorial teams, LMS sites, membership platforms, stores with managers, and partner portals. The plugin can require strong passwords, check compromised passwords against the Have I Been Pwned database, enforce periodic password changes, and reduce the lifetime of the login cookie. But each of those measures changes how people work.

Strong passwords and compromised password checks can be enabled almost immediately for privileged roles. Use frequent password changes carefully: if users are forced to change passwords too often, they sometimes fall back on predictable passwords or unsafe notes. Shorter session duration works well for administrators and editors, but verify that it does not interfere with long editing sessions, product imports, or support workflows.

Limit Login Attempts and CAPTCHA

Limit Login Attempts blocks repeated failed login attempts by IP or username, keeps an event log, and can show CAPTCHA after failed logins. It is a good defense against brute-force attacks and credential stuffing, but the thresholds should match the site. If the team works from a single office IP or through a VPN, an overly aggressive threshold can block several legitimate users at once. If the site is public and receives many attacks, the threshold can be stricter, but you should always keep trusted IP entries or a clear unlock procedure in place.

The official article about passkeys clarifies an important detail: Limit Login Attempts does not apply to passkey logins, because passkeys use a different cryptographic mechanism and are not based on password guessing. That does not mean you should disable LLA entirely. It is still useful for the standard login form where usernames and passwords remain available.

Firewall, 404 blocking, and vulnerability measures

The firewall in Really Simple SSL Pro operates at the WordPress level and helps block suspicious requests, IPs, regions, and scanning activity that shows up as a high number of 404s. It is not a replacement for network-level protection from the host or CDN, and the developers themselves describe it as part of a layered approach: a WordPress firewall can be combined with a cloud firewall as long as the functions do not conflict. The key point is that the WordPress firewall sees the site's application context, but it only acts once the request reaches WordPress, while a network firewall can filter some traffic earlier.

404 blocking: when to enable it, and why it may disable itself

404 blocking is meant for scanners that probe common paths from vulnerable plugins, old files, and admin URLs. The plugin can block an IP if the number of 404s exceeds the configured threshold. But the documentation describes an important exception: if the site's homepage contains broken resources of its own, such as a missing image, CSS file, or JS file, real visitors will also generate 404s. In that situation, Really Simple Security may disable the 404 Blocking rule so it does not block legitimate users.

That is why you should enable 404 blocking only after checking the homepage and key pages in the browser console. If you see 404s for site resources, restore the file or remove the broken reference first. Only then will firewall events reflect real attack behavior more closely rather than a theme issue or stale content.

Region restrictions and allowlist

Geolocation-based access restrictions are useful when a site truly serves a limited audience or is seeing a concentrated wave of attacks from a specific region. But for an international store, blog, SaaS landing page, affiliate program, or a site with a remote team, country blocking can unexpectedly cut off customers, editors, payment callback requests, or verification services. Review the event log and analytics first, then apply regional rules.

IP allowlist and trusted IP settings help preserve access when rules become stricter. But they also need care: a home IP can change, an office VPN can fail, and mobile internet is not always stable. For critical sites, do not rely on a single IP alone. It is better to maintain several access paths: an administrator account with 2FA, a trusted IP for the work VPN, hosting access, and a documented safe mode procedure.

Vulnerability detection and automated measures

Vulnerability detection alerts you when the WordPress core, a theme, or a plugin has a known vulnerability. The Pro version can apply vulnerability measures: attempt to force-update the component or place the plugin or theme into quarantine if no fix is available or the update does not resolve the problem. This is a powerful feature, but it should not be enabled as an automatic autopilot without understanding the site.

For an informational site, force updates are often reasonable: it is better to update a vulnerable component than to wait for a manual reaction. For a store, LMS, membership site, or a site with custom integrations, automatic updates can affect payments, user accounts, forms, or APIs. In those projects, define the notification flow, risk levels, and response process in advance: what can be updated automatically, what must go through staging, who decides on quarantine, and how quickly the result must be verified.

Practical scenario: bringing a client site into a secure working state

Imagine a typical case: a WordPress services site with a blog, a contact form, several editors, and a connected CDN. The site already opens over HTTPS, but the admin area shows mixed content warnings, the login page is regularly targeted by bots, and the owner wants visibility into which plugins require urgent attention. The goal is to configure Really Simple SSL Pro so the site becomes more secure without causing errors for visitors.

Goal and preparation

The goal of this scenario is to end up with clean HTTPS, baseline headers, enabled hardening, required TOTP for administrators, moderate Limit Login Attempts settings, a readable firewall event log, and vulnerability notifications. Before starting, create a backup, clean up the list of unused plugins, verify hosting access, document the current CDN rules, and temporarily disable overlapping functions in another security plugin if one is installed.

Configuration steps

1. Install the ZIP plugin through Plugins - Add New - Upload Plugin and activate it.
2. Open Settings - Security and review the dashboard: SSL status, open tasks, vulnerabilities, and recommendations.
3. Enable SSL enforcement and the 301 redirect only after confirming that the site opens directly over HTTPS.
4. Run the mixed content scan, fix obvious HTTP links in content, the theme, or builder settings, then clear the cache.
5. Run SSL Health Check and the security headers scan, enable the baseline headers, but leave HSTS Preload for later until the full domain check is complete.
6. Enable low-risk hardening measures: directory browsing, uploads execution protection, login feedback restriction, user enumeration protection, and file permissions checks.
7. Configure Login Authentication: required TOTP for administrators, optional or staged 2FA for editors, and a grace period for the team.
8. Configure Password Security for privileged roles: strong passwords, compromised password checks, and a reasonable session duration.
9. Enable Limit Login Attempts with a moderate threshold, CAPTCHA after several failures, and trusted IP entries for work access.
10. Enable the firewall event log, then turn on 404 blocking only after confirming that the homepage does not contain broken resources.
11. Configure vulnerability notifications and decide which components can be force-updated automatically and which require a manual staging process.

Verifying the result

After configuration, test the site as a visitor: homepage, services pages, blog, contact form, privacy policy, search, pages with images, and any iframes. Then test the site as an editor: login, password reset, 2FA, post saving, image upload, form submission, and logout. After that, open the Really Simple SSL Pro dashboard and the event log to confirm that new events look like real activity, not like a broken theme.

Also verify the external result: SSL Labs or a similar test, a security headers scanner, the browser console, and a network filter for HTTP requests. If a widget breaks after enabling headers, do not disable the entire plugin. First, identify the specific header that is blocking the resource. In many cases, it is enough to allow the required source in CSP or keep a softer policy until you move the external script to a safer setup.

Scenario nuance: do not treat the symptom with the wrong feature

If the dashboard shows a plugin vulnerability, the firewall will not fix the code. If the browser complains about mixed content, 2FA will not help. If an administrator is locked out because the grace period expired, security headers have nothing to do with it. Really Simple SSL Pro includes many modules, and the quality of the setup depends on whether you can map each symptom to the right area. It helps to keep a short mental map: HTTPS and mixed content are browser-facing security, hardening reduces the attack surface, login protection secures accounts, the firewall deals with suspicious traffic, and vulnerability measures address known component risks.

Post-setup validation: what to check in the browser, admin area, and logs

Validation is not only for the first activation. It should be repeated after plugin updates, theme changes, adding a new CDN, connecting a payment or script widget, and changing login rules. Really Simple SSL Pro provides a dashboard, but final confirmation always comes from several sources.

The public-facing site

On the public side of the site, check for browser warnings, missing images, blocked fonts, maps, videos, forms, and analytics. Pages should have one clear redirect to HTTPS, not a chain of three to five hops. If the site uses subdomains or a CDN, confirm that the certificate and headers apply to the correct hosts, not just the primary domain.

The admin area and login flow

In the admin area, test logging in with a normal password and the second factor, password recovery, changing the 2FA method in the profile, user status, the user list, and the event log. If you enabled a custom login URL, test the old wp-login.php, the new address, and any scenario where WordPress itself redirects the user to the login page. For a WooCommerce or membership site, always test customer login separately from administrator login.

Logs and external scanners

The event log is only useful if you can separate normal activity from noise. A few 404s from old images are a content issue. A stream of requests for nonexistent PHP files from old plugins is a firewall signal. Repeated failed logins using nonexistent usernames point to Limit Login Attempts. A plugin vulnerability means update, quarantine, or replacement of the component.

Once the checks are complete, you can move on to normal use. If you prepared a backup, enabled features gradually, and confirmed the results in the browser, admin area, and logs, then it makes sense to download the ZIP archive and test it on your own site or a staging copy.

Common Really Simple SSL Pro problems and how to diagnose them

Issues with security plugins often look the same on the surface: "the site is not working," "the login page will not open," "the browser shows a warning," or "users are complaining." But the underlying causes are different. Below are the symptoms most consistently confirmed by official documentation, support threads, and common WordPress practice.

The site opens over HTTPS, but the browser still shows a warning

Symptom: the page loads over HTTPS, but the browser still does not show a fully secure connection, and the console reports mixed content. A likely cause is that images, CSS, JS, or background resources are still loading over HTTP. What to check: the browser console, the Network tab, mixed content scan results, and both theme and CDN cache.

Fix: replace HTTP links in content and theme settings, clear the cache, then use the fixer as a safety net. If the source is inside CSS or JS, identify the specific file and plugin that generates it. Rolling back SSL enforcement is worth considering only in a large-scale failure where the site becomes inaccessible and you need temporary control restored.

A redirect loop appears after enabling HTTPS

Symptom: the browser reports too many redirects. A likely cause is conflicting rules in WordPress, on the server, in the CDN, or in the reverse proxy. What to check: the CDN SSL mode, any redirect rule in .htaccess, hosting settings, WordPress Address and Site Address, and the CDN cache.

Fix: keep one primary source of HTTPS redirects, clear the cache, and verify that WordPress can detect the original protocol through proxy headers. If admin access is lost, use file access and disable the conflicting rules carefully, without removing the site or any output files.

Activation checks fail or cURL errors appear

Symptom: the plugin cannot complete a check, fetch a page, or connect to an external service even though the public site still opens. The official documentation notes that cURL is used for SSL checks, the mixed content marker, and connections to product services, and that the errors are often tied to PHP/cURL, the certificate, the firewall, or server configuration.

What to check: the exact cURL error code, the PHP/cURL version, whether a server firewall is present, certificate validity, and whether the server can make outbound requests. In most cases, the fix is on the hosting side: update cURL or PHP, repair the certificate chain, allow the outbound request, or exclude a false positive from mod_security. Do not confuse a cURL error with a site outage: the documentation notes that these errors often do not break the public site.

404 blocking turns itself off or blocks the wrong users

Symptom: the firewall reports 404s on the homepage or disables the 404 Blocking rule, or legitimate users get blocked. A likely cause is that the page itself is loading missing images, CSS, or JS, so visitors generate 404s without any malicious behavior. What to check: the browser console on the homepage, the Network tab, the event log, and the list of resources returning a 404 status.

Fix: restore the missing file or remove the broken reference. Once the homepage is clean, enable 404 blocking again and tune the threshold. If the site receives many legitimate 404s because of old external links, do not make the rule overly strict.

An administrator is locked out because of 2FA or the grace period

Symptom: the administrator cannot complete the second factor, lost the device, did not receive the code, or let the grace period expire. The official instructions describe safe mode using an empty rsssl-safe-mode.lock file in the /wp-content/ directory, which temporarily disables 2FA checks. After login, the user settings should be reset and the lock file removed.

Fix: use safe mode only as an emergency procedure, then restore 2FA immediately. Do not leave the lock file in place permanently. To avoid repeating the situation, download backup codes in advance, configure a second administrative account with protected access, and set a reasonable grace period.

Two security plugins conflict or duplicate the same rules

Symptom: similar firewall, 2FA, header, or login rule features are enabled at the same time, which leads to false blocks, double CAPTCHA prompts, unexpected redirects, or conflicting headers. What to check: active modules in Really Simple SSL Pro, Wordfence, AIOS, Kadence Security, Sucuri, or another security plugin, as well as any rules on the CDN.

Fix: assign an owner to each function. For example, keep headers and SSL in Really Simple SSL Pro, malware scanning in another plugin, and the cloud WAF at the CDN level, but do not enable the same country blocks and login lockouts everywhere. The official FAQ for using it together with Wordfence recommends against turning on similar features twice.

When Really Simple SSL Pro is the right choice

Really Simple SSL Pro is a strong fit if you want a manageable path from "the site is kind of on HTTPS" to a more mature WordPress security configuration. Its main strength is the way it combines SSL, mixed content handling, security headers, hardening, login protection, firewall features, and vulnerability measures into one consistent workflow. That is especially useful when the site is handled by a small admin team and the goal is not just to install a plugin, but to understand exactly what changed.

Choose it if you want to configure HTTPS without chaos, protect administrator logins, identify vulnerable components, enable baseline hardening measures, and get firewall events without building separate heavy infrastructure. Do not choose it as the only answer for an already hacked site, a complex enterprise WAF architecture, or a situation that requires deep forensic file analysis. Those cases may call for Wordfence, Sucuri, hosting support, a manual audit, or restoration from a clean backup.

The best results come when you do not chase the maximum number of enabled switches. Start with a backup, enable modules in sequence, verify the result in the browser, the admin area, and the logs, and leave the more debatable settings for a later testing phase. Used that way, Really Simple SSL Pro becomes not a source of surprise lockouts, but a practical working tool for maintaining a secure WordPress site.