I am using MOSS 2007 SP 2. I enabled anonymous access on the site collection for lists only. When I try to call GetListItems on the lists web service on a list that does not have anonymous enabled using the list GUID in the request I get back 0 items. If I used the list name instead I get back list items. If I disable anonymous access for the site collection I also get back list items. Any idea what's going on?
Wrap your request inside authentication.asmx.
Use LoginResult method and based on the results of this function assign the CookieContainer of authentication web service to the Lists web service.