- Affected App
- WoltLab Suite Forum
When the maintenance mode is enabled you're sending a 503 status to the clients. This behavior is not without cause any side effects on servers on which PHP script are served through PHP-FPM and the Apache2 proxy_fcgi module, in conjonction with the ProxyErrorOverride set to On (which allows enforce sending of generic error pages). You should really considers to not send specific status code for the maintenance page.
See the related thread on our forums which provides more details.