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Troubleshooting Networking Issues with SNITrace

Bob Dorr digs into SNITrace:

For my specific issue I was attempting to debug why the SQLDriverConnectW errored with TCP 10054 because it was failing the pre-login handshake.  For that I first needed to understand and capture the flow of the handshake activities and this is where SNITrace is helpful.

Read on to see what it does and how it works, as well as some nice Wireshark screen shots.