Saturday night, I swapped an ISA 2000 server with a ISA 2004 server running Windows 2003 SP1. Since I had new hardware I was able to set it up before hand and cut over without too much trouble. The main problem I had was on my test computer I had TLS 1.0 and SSL 3.0 enabled so I didn’t notice that SSL 3.0 was not enabled on the server. ON IE6 TLS 1.0 is not enabled by default. (pretty stupid in my opinion). So I had to go into the security policy and disable the requirement for FIPS encryption.