Logging on to second trusted domain

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I've got a problem whereby I have two Windows 2003 domains set up with a two way trust in a school scenario, one an admin domain and one a curriculum domain. We have just replaced the Domain controller on the curriculum domain and obviously all policies etc should still be the same as before.They want to be able to log onto the curriculum domain using a curriculum account from a PC that is joined to the admin domain. When the logon screen comes up I can choose the curriculum domain but I am getting a message up saying " unable to log you on because of an account restriction". This is happening with all accounts including the administrator account. Anyone any ideas what could be causing this?

 

Thanks for that. I will have a look at those tools.
Yes all the roles were transferred to the new server and it is set up as a GC. When I go into AD domains and trusts and verify the trust, it is showing up as ok. Nothing pointing to anything in the event logs on the local pc or either DC. There are no signs of the old retired DC from the curriculum domain in Sites and Services. It really is doing my head in now!!

 

yes it was demoted properly. The message refers to an account restriction which makes me think its some sort of policy but I cant find anything.