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Event ID: 5502 Source: DNS

The DNS server received a bad TCP-based DNS message from <ip address>. The packet was rejected or ignored.
I had the same error on a Windows 2000 server box at 5-minute intervals. I figured out that the problem was caused by a netmon client trying to query DNS every 5 minutes.
A Win2000 Server running the DNS Server generates this message after a TCP connection on the DNS port terminates unexpectedly. Usually it can be ignored, since it should not mean that your server has any kind of problem.

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