i migrate the active directory on server 2003 to server 2012 r2 .i migrate all the 5 rule .
in the end of migrate i check the dns on server 2012 r2 and found a problem with the dns its not work. a simple query in monitor on dns manager fail.
i look at the event viewer dns no error . i demote the old server 2003 but not remove the dns and now i use the dns on it on my network.
i dont know what to do and need help.