The topic subject pretty much explains my problem. I decided to try out eGroupware in my eBox 1.2, which is otherwise working fine, but even after all the steps it requires (activating modules, setting virtual mail domain etc.) I cannot log in due to the error message about my session.
It definitely recognizes the user names I've tried, because a non-existent user produces
"Bad login or password" instead.
I managed to log in into the setup portion, though, so obviously it's not completely broken. I changed nothing besides adding a new interface language, having read that changes might conflict with the default settings created by eBox. The official eGroupware documentation says:
Check IP address of all sessions: This security feature prevents sessions from being hijacked by verifying whether the session is emanating from the same IP. Does not work necessarily if the attacker is using the same network.
Switch this off if users are regularly thrown out randomly: "Your session could not be verified".
...but I've seen no setting like that anywhere, and the behaviour definitely isn't random. Any idea what might be wrong?
Edit: By the way, I disabled some of the default eGroupware applications (felamimail, emailadmin), because I don't need email support.