Hi. I had installed and configured Win2003 Standard Server as a Domain Controller role in our network. I created the OU's and created domain and terminal users. Everything was working fine. But later on, I had tried to configure VPN settings via "Routing and Remote Access" window. I cannot succeed this connection and It was not really important for me so I gave up trying it. But later on, I saw that WinXP clients cannot join to this domain. It was giving "domain not found error". Then I checked my settings and I saw that NetBIOS over Tcp/IP was disabled under WINS configuration tab. I think VPN wizard made it. I have checked it. Now I can see the login window when I try to add the client to the domain in the client setup process. But any of the clients except administrator, cannot login to the domain controller. Now, If I add client users to a Domain Admin group, clients can login to the domain controller (In the setup process). Should I add all of my clients to this Domain Admins group? Considering the security, Should I made it? Or why users cant login to the domain controller after VPN setup wizard? (VPN is not enabled). What VPN wizard changed during setup or installation process because everything was working perfectly before it.