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Nslookup Fails 2008R2 on ESXi

I have one virtual 2008R2 server.  It was doing just fine.  Today DNS resolution began to fail.  All the other virtual servers, same vSwitch, vLAN, DNS servers, subnet, ESXi host, are fine.  I pull the vNIC, wipe hidden devices, reboot, add a new vNIC, don't connect it yet.  Configure the appropriate static.  Then connect it to the vSwicthc.  NSlookup works fine.  Great?  No.  Give it five minues and NSlookup begins to fail again.  Wash, rinse, repeat.

ESXi 5.0
VMware tools are installed

I appreciate the help!
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ASKER

Oh, and I can pin IP's all day long.
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IP v6 is disabled
Provider order - Tried both RD session host and MS Network at the top.
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The NIC is recognized as being on a "Domain Network"
SOLUTION
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Bruno PACI
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All, ended up being port exhaustion on the virtual switch.  System had been upgraded since 3.0 days, only 160 ports.  Bumped to 1060 ports and all is well.

Thanks!
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Solutions were just beginning to be developed when I found the error/solution.