Zimbra WebUI failure to login due to timeout

[BarthezZ]

Hi, I've been using zimbra for quite some while... But now i'm having an issues which is new to me.

When logging in to the webClient i'm getting an Timeout error of which I can't find the cause. It happens with multiple users, but another client which is already logged in still works.

What I've tried
- Other browser
- Other PC
- Other User
- Restarting zimbra and rebooting the server
- Check the logs for errors, there are none... just something messages like
"Total time for which application threads were stopped: 0.0001870 seconds
"

I'm running: Release 7.1.4_GA_2555.UBUNTU10_64 UBUNTU10_64 FOSS edition.

Alternatively, the http client port (I normally use SSL with an internal enterprise CA) isn't responding, altough zimbraMailMode is both...

Any clues would be greatly appreciated!