I have a NT4/2003 AD mixed environment. I have a few (less than 4) NT4 domain controllers, and 4 NT4 servers running Exchange 5.5. We have over 10 2003 AD controllers running our domain in 2003 interim mode. The plan was to leave the NT4 DCs in place until they could be removed safely. To get AD, we installed a new NT4 DC and made it the primary. Then I upgraded it to 2003 and installed AD. Just last week, we turned off that original upgraded NT4>2003 server in hopes of being able to remove it. We moved the FSMO roles to another 2003 DC. Recently I noticed the usrmgr is no longer working on the NT4 servers. And today I had a new user I created who keeps getting prompted for his user credentials from one of the old Exchange 5.5 servers.
I guess what I'm asking is, now the the upgraded NT4 server is powered off, the other NT4 BDCs are no longer able to function correctly. If this is the case, is there any way I can get them working again by some type of configuration? I tried altering the hosts/lmhosts files and pointing our domain to the 2003 DC that has the PDC Emulator role. This has not helped. I checked the syntax and structure of the hosts/lmhosts files and they are correct. Should we not have moved the PDC Emulator from the upgraded DC until the other NT4 servers were decomissioned? When I open usrmgr now I get the error that it can't find a PDC for the domain, so some domain wide functions will be disabled, but I can get in and see some servers. I assume I don't want to make one of them a PDC since that would undo what I did for getting Active directory running. But can I recover from this situation, getting the NT4 BDCs to see the new 2003 DCs?