Symantec Management Console works fine at the Server but when users are opening the console on remote computers (Windows 7/Vista/XP) they get an error message HTTP Error 401.1 - Unauthorized: Access is denied due to invalid credentials or the console simply doesn't open.
When the url is entered with FQDN the user is prompted a 2nd & a 3rd time,
and then a web page is displayed stating:
You are not authorized to view this page
and, further down:
HTTP Error 401.1 - Unauthorized: Access is denied due to invalid credentials
Internet Information Services (IIS)
The loop Back check was enabled.
Reboot the server.
If rebooting fails to allow access, check the below kb from microsoft