Contact US

Log In

Come Join Us!

Are you a
Computer / IT professional?
Join Tek-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Tek-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

when one DC is down users can not login due to primary DNS settings

when one DC is down users can not login due to primary DNS settings

when one DC is down users can not login due to primary DNS settings

We have three DCs (server 2012r2), each of them is also a DNS server. DHCP hands out DC1's ip address to clients as their primary DNS. We also have some fixed IP address clients with DC1 as their primary. They all have one of the other DCs as their secondary DNS setting. If DC1 happens to go offline, none of the clients with DC1 as their primary DNS can access their network resources/shares etc. Even if I reboot a client machine (windows 7) the users still can not log back on and get to their shares as long as DC1 is offline. Once DC1 is back online everything is back to normal. All of the DCs are GCs, all are replicating properly, the netlogon shares are all correct and replicated. This seems to be such a basic major problem that I have to think we have something set up wrong somewhere but I can not find anything to explain it. I can find other people having the same problems, but no actual solutions/explanations.

Can anybody tell me what we can do to prevent loss of one DC being able to bring our entire network to a halt?


RE: when one DC is down users can not login due to primary DNS settings

Expand out Forward Lookup Zones. Right click on the domain name and choose Properties. Click on the Start of Authority tab (SOA).

Set your Retry Interval to a value like 10 minutes. Systems should failover after that time frame.

Make sure also that all servers are listed on the Name Servers tab.

I hope that helps.



No trees were harmed in posting this message, however a significant number of electrons were terribly inconvenienced.

Check out my scripting solutions at http://www.thespidersparlor.com/vbscript


Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Tek-Tips Forums free from inappropriate posts.
The Tek-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Tek-Tips forums is a member-only feature.

Click Here to join Tek-Tips and talk with other members! Already a Member? Login

Close Box

Join Tek-Tips® Today!

Join your peers on the Internet's largest technical computer professional community.
It's easy to join and it's free.

Here's Why Members Love Tek-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close