iCal Server - Wiki Calendar - Path is resetted

Hi everybody,

having setup a 10.6 server with activated iCal Server. Working with exceptions as expected.

The Port for SSL iCal is openend in the Firewall, so the clients can access the Server.

The client is set to serverpath: "/principals/__uuids__/wiki-name/"

From time to time the client (Lion 10.7.2 all updates) is resetting the serverpath to "/principals/__uuids__/<unique_user_id>".

Can I prevent the client from doing that? Most of the time it's resetted, when the client is in a public WiFi.

Thanks a lot and greeting from germany.