mod-fcgid

I am running Plesk Obsidian 18.0.74 on Ubuntu 20.04. Multiple domains show 500 Internal Server Error in Webmail (Roundcube). Root cause analysis so far: Webmail virtual hosts generated by Plesk use mod_fcgid and set: • PP_CUSTOM_PHP_CGI_INDEX = “fastcgi” • PP_CUSTOM_PHP_INI =...