Windows 2008 R2 DNS Issues

By default 2008 R2 has enabled EDNS, but EDNS is not compliant with all domains as of right now. This causes DNS failures.

Fix

To disable EDns, you can do it from the command prompt, or by editing the registry.

From the command prompt, no restart of DNS is required. If from the registry, make sure to restart the DNS Server service.

Command prompt:

dnscmd /config /EnableEDNSProbes 0

No restart is needed. It takes effect immediately.

or Registry: </>

Create a DWORD called EnableEDNSProbes and set to 0 in HKLM\SYSTEM\CurrentControlSet\services\DNS\Parameters

Restart the DNS Server service for it to take effect.

Here is a link to the source of the fix:

Here is the windows kb article on the issue: http://support.microsoft.com/kb/832223

Techblog