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.com domain names suddenly don't resolve anymore on our DNS server

Earlier today our 2 DNS servers stopped resolving any domain name with .com. I can access all other domain names, internal, but for external I can only access .org, .edu, .net, etc, but cannot access .com domains. I have never seen this before. Any ideas?
1 Solution
Zephyr ICTCloud ArchitectCommented:
Is it Windows 2008 R2 ?

There is a KB that might be interesting: http://support.microsoft.com/kb/2508835
Do you host private DNS servers to resolve internet URLs? I believe that you use forwarders on your internal DNS server that handle all the non internal DNS resolutions?
I guess it's a problem at your ISP side. Have you contacted them already? What was their reply?
Jan SpringerCommented:
I would recommend installing dig and:

dig domain.com +trace

from within the c:/dig directory
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nismor240sxAuthor Commented:
So after hours of messing with it, it turned out an employee added a DNS entry for ".com" all by itself. I eventually found it on the list of my DNS records and once I deleted it, everything worked.
nismor240sxAuthor Commented:
I contacted the ISP and they reported everything was fine on the reverse DNS, etc. Finally after hours of searching I was able to figure it out.
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