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Nagios connection reset (RST) “Misplaced TCP option (SACK)” - No data was received from host

This issue is a strange one. I have a Nagios server running for quite a while now, and all of a sudden I can't get data from 2 hosts... The hosts are located in a different subnet: Nagios: ...
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TCP RST Reset Every 5 Minutes on Windows 2003 sp2

Recently I had a web developer come to me and ask why he was receiving connection errors in his app that was accessing a sql database. So, I went through my normal trouble shooting steps to isolate ...