2008 R2 DNS does not resolve external websites until I clear DNS cache

Do I need to apply this hotfix
http://support.microsoft.com/kb/2508835/en-us
MCSE Certified

Thank you for posting the ipconfig /all, but we can't use it since the relevant data that we need to evaluate has been blocked out. I can understand if you have a strong security policy.
The Conditional Forwarders shouldn't be causing you to not to resolve specific domain names.
How long has this been going on?
What exactly occurs? Does DNS stops totally responding when you test it with nslookup, or are you just testing it with Internet Explorer?
If you have nslookup tests and responses, it may be helpful to see them, but if your security policy prevents you from posting them, I understand.
I'm curious about this part that you posted:
> "And as suggested by microsoft
> earlier,we have blocked few DNS
> Domains by creating conditional
> forwarders , pointing to
> our another domain."
Did you open a ticket with Microsoft support that provided this suggestion? If yes, you can email your support engineer that assisted you.
Or did you post this in this forum or elsewhere that you received this suggestion? If a forum post, do you have a link?
Without specifics, it may be difficult to assist. However, what I can provide are the following hotfixes. The second one you had already installed. I suggest and recommend to install the others.
1. 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
2. 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
3. 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/
4. 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
If the above do not help or provide improvements, I highly suggest to contact Microsoft Support for specific assistance. Here's the link if you decide that you need to go with this option:
http://support.microsoft.com/contactus/
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
Complete List of Technical Blogs: http://www.delawarecountycomputerconsulting.com/technicalblogs.php
This posting is provided AS-IS with no warranties or guarantees and confers no rights.

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