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DNS Monitor - TCP

When using the Application Performance Monitor to monitor TCP port 53 on several Windows 2003 R2 Servers several servers show the status as down because "The return code is different than expected."

An ideas?

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Accepted answers

josh.clark

That message occurs when the response from the DNS server has a return code that is not 0 (success). The DNS monitor does an ANAME query for "a.root-servers.net". If the DNS server's response is not valid or the return code is not success (0) then the monitor fails.

All comments

josh.clark

darrylb

Spot on, once the DNS servers had access to "a.root-servers.net" the DNS servers showed as up

swilliams

Can that be changed to query for a custom ANAME?

josh.clark