Weird DNS issue

Hi Guys,

I have a simple network with 3 DC's and 2 DNS servers.

One of the DC's is my new 2012 R2 server with DNS.
The other  two DC's are 2003 - one with DNS.

The 2012 server has assumed all the FISMO roles.   The server that used to contain these roles also had DNS.   After transferring the roles to the 2012 server it has been demoted to a member server and had DNS removed.

One thing I noticed that on the older DNS server there is only one entry under the DNS in the tree and it happens to be the name of the server.

The 2012 server has TWO entries under DNS:  one is the name of the 2012 server (like on the 2003 DNS server) but it also had an entry called:    server.domain.local

It it normal to have two entries on a 2012 DNS server?

dcdiag /test:dns returns no errors on either server.

I still think something is wrong, however, as I have a 2008 R2 server that is setup as a Remote Desktop server.   It was working fine but now I cannot ping it.   Remote desktop also fails.   The server itself can surf the net and ping other servers.   However, I cannot ping it from my desktop or the above servers.   It's very weird and I suspect something in DNS.

Any ideas where to look?   I've run /flushdns on all machines I'm testing with....and everything got rebooted yesterday due to an untimely tree falling on an electrical line.


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iteched1Author Commented:
Ok just figured out the dual dns entry issue - it's normal so I'm OK there.

The other issue persists....
You cannot ping as name, probably. Can you ping it by IP address? If the answer is no, the problem is at connectivity level, not DNS

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iteched1Author Commented:
Well - I seem to have fixed the problem.

During the power outage I'm almost certain a particular switch stayed up the entire time.    I power cycled both (even thought the server had been previously) and now it is working.

So yup - likely a connectivity problem generated by the switch staying on while everything else was off.   I'll keep my eye on it for a bit but hopefully all is well now.

Thanks!  Ed
You're welcome! :)
Best regards!
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Windows Server 2012

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