I know this question may sound repeditive, as the topic has been on a couple forums already, but i had some more specific questions about it. I recently had upgraded my domain from a 2003 domain and forest function level with one 2003 DC and one 2008r2 DC, to 2 2008r2 DCs. After running the BPA for DNS i got the error notification that everyone would expect (can't find that _msdcs AD zone). After completing the steps in making it a new primary AD zone, all of the errors in the BPA went away.
The question that I have is would the absence of a _msdcs zone cause an application to fail, if the application was using ldap to query my domain controller for user credentials? Also, would it cause ldap errors sometime and not other times? I keep thinking that SRV records live on the DC and the application points to the DC, so there shouldnt have been any problem. Maybe this issue is just specific with this application? I need some answers from somebody who may have come across a similar problem.
