We have Windows 2003 R2 and Windows 2012 R2 Active Directory model.
Root domain have TWO windows 2012 R2 DC's and THREE Windows 2003 R2 DC's.
Child Domain have TWO WINDOWS 2012 R2 DC's and TWO Windows 2003 R2 DC's
Each site have Windows 2003 R2 DC's
All DC's are running DNS Service and 1 additional DNS Server is also available which holds secondary zones.
I came across strange issue. While fixing my replication issues appearing on DCDIAG, I added Master Servers under additional DNS Server and my replication starts without any error. But automatically my _mcdcs.root.domain converts to ForestDNSZone and after 1 days root.domain and child.root.domain also change to ForestDNSZone. The evernt which logs this entry showing my user ID for this change but I didn't change this manually.
Please help me if there is any possibility of happening this automatically. Might be as I replicated and replication completed successfully this converts and as I did the replication the event for changing is generated with my ID.