If you use FW Client (as I do) you can access IM and other related services during VPN sessions. But to do this, I can't keep the autodiscovery feature of FW Client enable during the sessions because the FW Client shows that it can't find the ISA Server. I dont understand, in my LAN the Autodiscovery works fine, during VPN sessions I can ping the ISA Server using IP address, NetBIOS Name and DNS Name. Do you have any idea about why it happens?