401.1 Unauthorized error while accessing the console from the Notification Server using an alias name. If you access the console using IP, Hostname, FQDN or Loopback it works fine. Remote machines can also access the console using the alias name without getting the error.
401.1 - Unauthorized
You do not have permission to view this directory or page using the credentials that you supplied
This problem occurs because a security feature named loop back check functionality.
Disable the authentication loopback check
Note You may have to restart the server for this change to take effect but I did not have to with the Server 2008 R2 machine I was working on.
See Microsoft article for more information: http://support.microsoft.com/kb/926642
SMP 7.5 SP1