Forum Discussion

sdavids5670_166's avatar
sdavids5670_166
Icon for Nimbostratus rankNimbostratus
Aug 07, 2014

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

We are rolling out a new web application in a couple of weeks and the developers have noticed issues with the application that are very intermittent and difficult to quantify. Testers have reported ...
sdavids5670_166's avatar
sdavids5670_166
Icon for Nimbostratus rankNimbostratus
Aug 14, 2014

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.