DNS issue

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    We have about 150 people in a site. There are 2 DCs, each server DNS.

    Internet requests started getting painfully slow, so I looked more into. Turns out it’s DNS resolution that’s being very unpredictable. I have the DCs forwarders set to our ISP DNS.

    If I go to the DC and do an “nslookup”, I can’t get anything to resolve. If I set my client DNS to something public (, everything is totally fine, so it’s definitely DNS the problem.

    What else can I look for? I can’t resolve names on the DC, so no way the client passing requests to the DC will get DNS back. It’s not all the time, but probably 8-9 sec for a resolution.

    any ideas?

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