Health check failing - tcp/54321 - is this more than a coincidence?

FYI, F5 came back and said that the tcp/54321 issue is a known bug with their product (although good luck finding any information on it). You basically need to configure the F5 to not use 54321 to health check (or any other reason). We were getting tons of health check errors and after we disabled 54321 AND (more importantly) disabled TSO ALL of our problems vanished and the end users are much happier. If you're not familiar with TSO (TCP segmentation offloading) get up to speed on it and turn it off.