DNSCache excesive memory usage Windows Server 2008 R2

Posted by MikeT on Server Fault See other posts from Server Fault or by MikeT
Published on 2012-10-04T11:56:04Z Indexed on 2012/10/04 21:40 UTC
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Filed under:

dns

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windows-server-2008-r2

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memory

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memory-leak

We are having an issue with the dnscache service where its memory usage is becoming excessive (~6GB) after a week or two.

Restarting the service frees this memory but performing ipconfig /flushdns does not, an ipconfig /displaydns shows aprox 15-20 entries in the cache.

We have checked and there appears to be aprox 150 DNS queries per second taking place but I would not expect this to have the effect of causing this memory issue.

I have tried to search MSDN for hotfixes or bug reports but I could only find a reference to a memory leak in windows 2003. can anyone suggest how to proceed.

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