I have implemented a new domain controller running dns server into the domain and have demoted and removed the old one from operation. Ever since i have demoted the old server and physically powered it off, users are complaining about Internet access and email sending and receiving from their pop account as being slow.
On the new dns server, there are still ns entries for the old dns server in both the _msdcs and the normal domain zone. The Host(A) record for the old server still exists in the normal domain zone. Can I just go into the dns mgmt console, right click on these 2 zones, go to properties, and under the Name Servers tab just highlight the server that no longer exists and delete it? Will this also cleanup and delete the Host(A) record that still is listed? Will this have any ramifications on anything else in DNS or in the production network operations?