I have our ISA server set up in Integrated mode ie it is both firewall and cache. It is behind another firewall and we use integrated authentication for out going web requests. The ISA is a member server of our Active Directory domain. We use proxy client to authenticate our users enabling them to browse the WEB etc. This works well. We also have two Mail servers behind the ISA and published through it. This also works well. However we also have a small number of PC's with Firewall Client running on them. These PC's appear to have access with out authentication. That is they show up with firewall sessions running even when the user has supposedly been blocked. Do I have a configuration problem? What is the fix to make sure that the Firewall client also uses user authentication? Thanks for your help Don