Users connecting to the office LAN by VPN are getting a 401 error when they try to log in to CRM 2011. Local users login successfully. This problem has only been occurring for a week having been working fine until then. I am not aware that anything has changed. Previously remote users would open the CRM url and domain login credentials were requested. Local users log in to CRM automatically as the current windows user.
The error in the IIS log is 401 5
IIS is version 7 on Server 2008