Issues on domain when shutting down old DC

We recently added a new domain controler, as well as a new dedicated terminal server, to a network.  After moving over DNS, DHCP, FSMO roles, files and shares, we shut down the old DC before running DC promo on it as a test.  Everything was fine for a couple of hours, but then they started having problems.  Outlook would not connect, instead, it gave users the message "outlook is requesting data from the server".  Users could not log in to the terminal server.  When we turned it back on, everything came back up.  Any ideas on what we should look at?
Infinity SolutionsData, Voice, Internet ServicesAsked:
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Infinity SolutionsData, Voice, Internet ServicesAuthor Commented:
Both the Exchange and Terminal servers were configured to look at teh old server for DNS.  I just fixed this.  We will test again shortly to see if that clears this up.
Timothy McCartneySYS ADMINISTR I INFRASCommented:
It's very likely that that is the issue. We had a very similar problem with one of our clients. Their primary DC had started having issues with AD, so we moved the role to another server, however the issue wasn't fixed until we realized the DNS settings needed to be adjusted.

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Suliman Abu KharroubIT Consultant Commented:
As a post DC promotion process, run dcdiag in the new DC to test dc functionality.
MASEE Solution Guide - Technical Dept HeadCommented:
change the dns address in exchange network card and run the below command /prepareAD
Infinity SolutionsData, Voice, Internet ServicesAuthor Commented:
Yes, that was the problem.  We've been running smoothly since then.  Thanks for the help.
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