[Dovecot] Error message Apache

[Frank van Amsterdam]

I've setup Apache 2.2.9 for SOGo 1.3.2 on Debian 5.0.5. I know that the developers of Debian 5.0.5 are sometimes making choices which are not handy.

Which modules in Apache do I have to enable to make SOGo 1.3.2 working? That's what I understand from the error message here under.

Greetings, Frank

Proxy Error
The proxy server received an invalid response from an upstream server.
The proxy server could not handle the request POST /SOGo/so/test/preferences.

Reason: Error reading from remote server