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NT trust relationship - Urgent!!!!

Hi Experts,
I have an emergency situation. It is kind of long story. I had a NT (PDC and BDC) domain and 2003 (three ADs) domain and Two ways trust relationship worked fine. When I have to upgrade the 2003 AD to 2008 R2 AD - I just added three more 2008 R2 servsers while 2003 ADs still up and running, I knew the trust relationship won't work so I upgrade NT to 2003 AD and established the trust relationship.

Now I have a 2003 domain (2 ADs) called NT, and a 2008 R2 domain (four 2008 R2 and three 2003) called DOMAIN.

I wanted to demote those 2003 ADs after transferring FSMO roles to 2008 R2 server. Everything went OK. Now 2008 R2 has all roles. Before I demote, I wanted to test to see anything complains if I just shutdown
three 2003 ADs.

Yes, the trust relationship broke and almost sametime NT BDC also crashed coinsidently. All 2008 ADs and 2003 ADs are up and running. PDC NT domain (this is actually 2003 domain) but BDC NT is down.

I once was able to establish one way trust relationship but it keeps dropping.

This thing is that I can access some servers from new domain to old without typing credentials.
I don't know what seems to be problem. Because of BDC down, it is not working?
I really appreciate if you can provide the steps and anwser my questions right away.

Thanks in advance
2 Solutions
Krzysztof PytkoActive Directory EngineerCommented:
Please verify if you olso raised Forest Functional Level to 2003 and then test forest trust again.
How to raise DFL and FFL you can find at

Ilya RubinshteynCommented:
BDC crashing would not prevent domain from working unless all your FISMOs as well as GC were on it. Verify your roles, ensure that GC is on both servers. You will have to reestablish the trust to the new DC's prior to removing the old ones to prevent any idiosyncrasies between 2k3 and 2k8
KseanAuthor Commented:

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