I've just read something on the Internet, which makes me writing this post.
There are many people not realizing a few things when it comes to the interaction of the DNS Client- and the DNS Server-Service - so here are some common misunderstandings:
I don't need the DNS-Client-Service on a DNS-Server
The DNS-Client resolves for the applications on that machine, the DNS-Server serves whichever DNS-Client is asking him.
If I'm trying to ping a computer per FQDN on a Server which is also DNS-Server, I can not reach/resolve it. However the server must be able to resolve the name, because when I'm looking in the DNS-Managementconsole I can see the record.
Meep - wrong - the Server does not directly care what records the DNS-Server on the same machine is holding. The DNS-Client is asking the DNS-Server he's configured to use, which may not be the local DNS-Server.
What is wrong? For App-X Nameresolution is working, because I'm able to nslookup the name, however the app is not able to reach the server.
Try to ping the name of the server instead of NSLookup. If NSLookup works but ping doesn't resolve it to a IP, restart the DNS Client-Service. NSLookup brings his own resolver and does not proove if the DNS Client is working, it's only there for troubleshooting Name Resolution. Actually there are behaviors where NSLookup even resolves slightly different than the DNS Client.
I'm hardening my server by disabling unused services. DHCP Client is one of them, because I'm statically configuring my IP-Adress, so I don't need it.
Usually the DHCP Client-Service takes care of registering Records in the Reverse Lookup Zone (PTR-Records) in DNS, so you might want to keep it.
I have configured a second DNS-Server in my DNS-Client, so my DNS-Client is able to resolve names even if the DNS Server-Service is not working / stopped.
This is a huge one. The second DNS Server will only be asked if the server is not reachable via TCP/IP. As long as it answers via IP it does not matter if the DNS-Server is answering or not.
I'm sure I forgot many of those rumors - so if you have some to share please provide comments, I'm happy to update this post.