today I installed PHP 8.0 and updated an (compiled) PHP 7.4 Version with an Packed one.
After anything was done without any Error the Website can't be loaded anymore. I looked into the error Log an saw this:
- [Thu Nov 04 10:00:26.932719 2021] [proxy_fcgi:error] [pid 20143:tid 139730217842432] [client xxx.xxx.xxx.xxx:58290] AH01071: Got error 'PHP message: PHP Warning: session_start(): Failed to read session data: user (path: /var/www/virtual/domain.de/phptmp) in /var/www/virtual/domain.de/htdocs/libraries/joomla/session/handler/native.php on line 260'
After I switched to an compiled Version of PHP 7.3 I could load the Website again.