I still haven’t found any decent solution to the compression, but I did find a solution to publishing NTLM websites. Basically, ISA 2004 didn’t have any pre-authentication, where ISA 2006 does. Why I wasn’t experiencing any of this on my websites was because the ISA machine is on the same domain. In order to fix this, I had to use LDAP pre-authentication. I used part of an article posted on isaserver.org. It got me working to a certain extent, but then I had to play with it a little bit more. No big deal, it’s all working now.
Now just to fix the compression part…