Trusted Connection to SQL fails after connecting to a VPN

view story

http://serverfault.com – I have a development server with an SQL 2008 EXPRESS instance running on it. The domain is called DEVAD, and the instance is enabled for Shared Memory, Named Pipes and TCP/IP. My workstation PC is on a different domain called AD. I have domain trusts set up between AD and DEVAD, and I can connect to the DEVAD instance using my AD credentials, via SSMS or .NET programs. Unfortunately, the moment I connect to another network via a VPN using credentials for a different domain, I get the following error "Login failed. The login is from an untrusted domain and cannot be used with Windows authen (HowTos)