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Server 2008 DNS issue

Posted on 2011-02-22
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Last Modified: 2012-05-11
Recently disabled DNS on one server, and enabled it another. After the move, i am finding mail building up in the queue for a specific external domain. Upon further investigation, i found that an NSLOOKUP fails on the new DNS server; which our mail server points to, but works successfully on the OLD DNS server. What am i missing that would have caused this during setup on the new DNS server? Is this a forward lookup issue?
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Question by:mray77
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LVL 12

Accepted Solution

by:
Nenadic earned 500 total points
ID: 34950868
How is your new DNS configured for external lookups? Does it rely on Root Hints or do you forward requests to an ISP?  If former, make sure your firewall allows UDP:53 outbound from new DNS server. If latter, again confirm firewall rules are in place, but also confirm that you have the correct IP address of the ISP DNS server.

Other potential causes: routing infrastructure - can you PING any external site by its IP address from the new DNS server?
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Author Comment

by:mray77
ID: 34950881
I was just looking again, and no forwarders were setup on the new DNS server. They should be pointing to AT&T (ISP). How do i get the most current information available from AT&T? I supposed in the interim i can just use the IP's i had configured on the old DNS server; which seem to work anyway. thanks for the help...
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Author Comment

by:mray77
ID: 34950991
No forwarders were configured in DNS.
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LVL 12

Expert Comment

by:Nenadic
ID: 34951010
Thanks, mray. I almost feel bad for taking points when you worked out the solution, so if there are any additional questions, I'd be happy to try and help.
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