DNS nslookup issue

Question

Hello,
It is in continuation of my previous thread;
http://social.technet.microsoft.com/Forums/en-US/4cb781c2-7da5-4da8-aa4a-b62dd8b122c4/nslookup-issue?forum=winserverNIS
I have two sites main and dr. In each site we have 4 domain controllers running on windows 2008 r2. when i try to nslookup from dr domain controllers to our Domain name (ads.pnu.edu.sa), it gives me two times "Time out for 2S" and after that it
properly shows me the IP addresses of the servers of my domain. I need to investigate why the RTO is coming. i am attaching the nslookup and ipconfig snapshots.
I disabled ipv6 from registry. all is working through normal ping and there is PTR for the server in DNS. Appreciate if anyone please guide.

Answer 1

When you put a period on the end of it, it will not use the search suffixes. Here's more info on that and how and why it works:
Nslookup suffixing behavior
http://blogs.msmvps.com/acefekay/2013/02/17/nslookup-suffixing-behavior/
Are you concerned that your servers, applications or something else is not properly working? Nslookup is good for testing, however, you have to remember that an app doesn't use nslookup. It has its own built-in resolver. If you use ping, which uses the machine's
client side resolver, do you see any delays or non-resolution issues?
Are your DNS server patched and updated?
===
If it's doing it for other records too, then Run the following, and if the hotfix is already installed or it doesn't apply
due to service pack level or operating system version, no fret, the installer will tell you right away and will tell you to
stop. Some of them require restarts.
DNS Server service does not use root hints to resolve external names in Windows Server 2008 R2
Post Windows 2008 R2 SP1 HOTFIX available.
APPLIES TO •Windows 2008 R2 Datacenter •Windows 2008 R2 Ent •Windows 2008 R2 Std.
Requires a restart.
http://support.microsoft.com/kb/2616776
DNS Server service does not resolve some external DNS names after it works for a while in Windows Server 2008 R2
Hotfix release - (released 4/15/2011)
http://support.microsoft.com/kb/2508835
Windows 2008 -
DNS queries for external domains are not resolved when you use Conditional Forwarding in Windows Server 2008
Post Windows 2008 SP2 Hotfix available
Requires a restart.
http://support.microsoft.com/kb/2625735/
DNS server stops responding to DNS queries from client computers in in Windows Server 2003, in Windows Server 2008 or in
Windows Server 2008 R2 - Post Service Pack Hotfix available.
Does not require a restart.
http://support.microsoft.com/kb/2655960
And if nslookup times out on MX records, it's by design:
NSLOOKUP Returns Time-out Error When Query for an MX Record
http://support.microsoft.com/kb/198551/en-us
Ace Fekay
MVP, MCT, MCSE 2012, MCITP EA & MCTS Windows 2008/R2, Exchange 2013, 2010 EA & 2007, MCSE & MCSA 2003/2000, MCSA Messaging 2003
Microsoft Certified Trainer
Microsoft MVP - Directory Services
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