Knowledge base

Warnings & Errormessages

How to solve a http 500 error on activation of Really Simple SSL

Low memory on your site when activating Really Simple SSL can result in an http 500 error page. Sometimes you can resolve this by deactivating your caching plugin, and disable the “flush rewrite rules on activation” checkbox. This bypasses the rewrite rules flush, and your cache doesn’t have to be regenerated, which saves a lot …

Really Simple SSL proSettingsWarnings & Errormessages

Inserting HSTS header using PHP

HSTS Header insertion Really Simple SSL pro has the ability to set HSTS header for your website. In most cases this is done by inserting the HSTS header in the .htaccess file used by Apache and related webservers. Inserting the HSTS header in the .htaccess file is a reliable way to send the HSTS header when …

Mixed contentReally Simple SSL pro

Locating mixed content in widgets

Sometimes the scan finds mixed content in widgets. If you see this message it’s likely there’s a link to an image in one of your widgets which isn’t available over https://. The scan helps you locate the widget in which the mixed content is found. In the screenshot below you can see a result from …

Excluding/including SSL on specific pagesRedirect rulesSSL certificate

AutoSSL Let’s Encrypt plugin cannot verify domain because of .htaccess 301 redirect

I recently came across an issue where the AutoSSL let’s encrypt plugin can’t verify the domain. Strange though it may seem, this tool needs to access the website over http to renew the SSL certificate. A solution can be to disable the .htaccess redirect, renew, then enable again, but this is not a very elegant …

Mixed contentPlugin conflicts

Known plugin compatibility issues

In some cases there are compatibility issues with other plugins. Most of the time this is caused by another plugin blocking the mixed content fixer. The following plugins appear to conflict with Really Simple SSL: Plugin Organizer Updating to the latest version of Plugin Organizer should fix the issue that other plugins are disabled after …