>We installed WinNT option pack 4.0 for our IIS in a server with a proxy running. Installation is successful, proxy works well but our local intranet doesn't. We are using the default web site to be our local intranet but we can't make it run. It gives an error URL could not be retrieved; access is denied when trying to invoke http://localhost/ even in the server itself.

I could be off here, but I thought that Localhost was to reference a server running on the same machine. If the server is on another machine on the LAN, try using the machine name or IP address.