I just installed 7.40 OMSA on a 2950 domain controller. I have tried EVERY SINGLE combination of domain credentials and am unable to logon to Open Manage Server Administrator.  Here is the logon screen, I have tried both check boxes : Use OMSA Extended AD Schema and Ignore Certificate Warning but no luck. I have used the machine name in addition to the IP address for the Hostname. I keep getting a big fat Logon Failed, Connection Error message each time. 

Thanks for any fresh ideas..