Intranet Vs Proxy

I have a Windows 2000 Server. I’m running a small intranet through IIS for a small group(5) of users. Recently, I took cable internet connection and it’s being shared to others through Proxy. The proxy I’m using is: AnalogX Proxy. It’s very limited features, no complex configuration, just on/off check buttons for different services (HTTP, FTP, Gopher etc).

Now, except on Server, other users are unable to access the intranet. Users getting the login page but their logins were not processed. They’re getting HTTP 401.2 – unauthrozed access error. On one system, they’re not able to access even login page too.

It would be nice of you,if can tell me where the problem lies (IIS or Proxy) and what’s the remedy.

Thanking you in anticipation