A question: Are you using eGroupware in the local network, or from the internet?
I use eGroupware in the local network with local network proxy exception.
I'm not sure, if havp could handle session files. But i had no problems, to connect to other sites over havp, which deals with session files.
If the problem could not be solved, a workaround is to configure squid with an exception, like this:
Code:
acl NOSCAN dstdomain yourside.de
always_direct allow NOSCAN
In the evening i have the time, to test eGroupware with havp.