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Fixing Active Directory DNS (_msdcs, _sites, _tcp, _udp)
By Jesse | April 23, 2009
Have you ever accidentally deleted the AD DNS settings such as _msdcs, or installed AD and then needed to add a DNS server? How do you get AD to build it’s DNS settings. As you know AD is very tightly bound to DNS so if those settings are not there, DNS is probably going to cause a world of hurt moving forward.
Never fear, this can easily be fixed. To fix this, download the Windows Support Tools :
After installing the support tools, verify your dns on the server is set correctly. Generally I set domain controllers to have their DNS boxes BLANK.. (ie they use themselves to resolve DNS. If they cannot find the DNS entry they seek, they use the root servers to do recursive queries.).
To check dns, goto TCP/IP properties of your Local Area Connection.. and in the “Use the following DNS server addresses:” set this value to blank. It should give you a message when you hit ok that it is using localhost as the DNS server.
Now goto the command prompt and in c:\program files\support tools run :
dcdiag /fix
then run
netdiag /fix
Finally run
ipconfig /flushdns
ipconfig /registerdns
net stop server
net start server
If you refresh your DNS you should now have all your entries in DNS that you need for AD to work properly.. The above command verify more than just fixing the DNS issues, but it doesnt hurt to run them and the dcdiag and netdiag will make sure your AD / DNS are the way they need to be.
One other note. Net stop server stop more than just DNS .. it also stops Netlogon and Distributed File systems. THESE SERVICES DO NOT START BACK UP ON THEIR OWN– so after you’ve done the steps above I recommend either a quick reboot or if you cant do that go into service and start any automatic services that are stopped (such as netlogon and distributed file systems.. Your server should now work fine!
Now sit back and relax.
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Topics: How To, Microsoft Windows | 3 Comments »
February 16th, 2010 at 10:47 am
thank you for your helping, its quatly good for me, your site. I saved my server with your DNS helping
March 17th, 2010 at 5:02 pm
Thanks you for the great step by step articel. It help me to solw my DNS issue. cheers,
March 22nd, 2010 at 2:03 pm
What would you recommend setting this to then?, I suppose alternately you could set the DNS to no do recursive lookups…. But then if the server isnt authoratative, you have a problem. Alot of people put their ISP’s DNS settings, but this is wrong as these are supposed to list alternate DNS servers that are DNS peers.
JV