win 2003 server as workstation in win 2003 server domine

I’ve got win2003 server with DC and 2nd one stand alone server (also 2003), all workststions with XPpro are connected to the domina fine but stand alone server on win 2003 cant see the domine. The problem is that on this stand alone server i’ve got application which should use domine users so at the moment i can’t run it. Does anybody know what might be the problem?