[THIN] Problem with ISA server, and CSG being able to connect.

We use ISA server internally (and Surf Control) for all the usual internet 
access reasons.  Here's the problem:
I've got an external NFUSE site that I need to connect to.  Our users don't 
have a problem connecting to other sites.  SurfControl shows the user name via 
the proxy login and the internet connection passes through and stuff works.

BUT, when I try to connect to this remote (outside our network) CSG server.  I 
do not see the proxy log a username in.  I'd show up as anonymous and then my 
rules on the ISA box block the connection.

If I turn off all rules on the ISA server it works.  (kind of defeats the 
purpose of using a proxy, but I did have to try)

Is anything funky going on with authentication to a CSG site that I need to 
know about on my ISA server.  I have other sites using port 443 and haven't had 
a problem.  I just need to know:
1. what else I can tell anyone for this to be useful
2. has anyone run into this?
3. has anyone solved this. 

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