Knowledge base

SSL certificateWarnings & Errormessages

err_SSL_VERSION_OR_CIPHER_MISMATCH

err_SSL_VERSION_OR_CIPHER_MISMATCH This error means that the server and client (browser) are unable to establish a secure connection between them. To establish a secure connection between the server and client they need to have a cipher in common to understand each-others messages. If the ciphers don’t match the server and client can’t communicate and it results …

Warnings & Errormessages

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

When you have white screen, or a http error when activation Really Simple SSL, this can have two causes: your site is low on memory, or there’s a plugin conflicting with the flushing of the rewrite rules. Low memory on your site when activating Really Simple SSL can result in an http 500 error page. …

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 …