I'm setting up a new server with Mac OS X 10.6.3. So far users can connect to the server (when logged in local on a workstation). The workstations are connected (as expected) to the Open Directory domain. It's the combination that doesn't work. When I want to log in, from the Mac OS X login window, as a network user the system reports an error "You can't log in with user account [testuser]" (translated, I don't know the exact English message).
As far as I can tell accounts are properly configured, allowed to log in, there are no password policies set yet. So I'm a littlebit puzzeled. I didn't get similar problems with earlier server setups which I set up more or less the same.