Error: Userenv 1054 on domain controller

[Vicious]

I am getting the 1054 on my computer that is the domain controller. Below is the full details that you can check:

Event Type: Error
Event Source: Userenv
Event Category: None
Event ID: 1054
Date: 9/28/2007
Time: 10:09:18 AM
User: NT AUTHORITY\SYSTEM
Computer: BILSKYSERVER
Description: Windows cannot obtain the domain controller name for your computer network. (An unexpected network error occurred. ). Group Policy processing aborted.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

[MattyBoy]

If you want to resolve this behavior, correct the DNS address in the Internet Protocol (IP) properties:

1. Open Network Connections in Control Panel.
2. Right-click Local Area Connection, and then click Properties.
3. Click Internet Protocol (TCP/IP), and then click Properties.
4. Type the correct DNS address in the Preferred DNS server box.
5. Click OK.

[Tomthegreat]

I was also getting the same issue. Whatever tests I was doing was fine except the user login over VPN. The GPResult and netdiag gave no errors. We have changed the MTU size for the VPN traffic to 1400 and the issue was solved.