More user-friendly error message for connectivity issues

Hello,

After a couple of cases where end-users were perplexed by the following error message, I thought it might be better to state that we were able to connect over TCP explicitly, instead of referring to just 'connection', so that we can make the customer's troubleshooting easier?

memberlist/state.go

Line 472 in a43ca4a

    
           m.logger.Printf("[WARN] memberlist: Was able to connect to %s but other probes failed, network may be misconfigured", node.Name)

Something in the lines of "memberlist: Was able to establish TCP session to %s but other UDP probes failed"? Would that make sense? It will certainly help the user to know what exactly to follow-up on.

Thanks,
Krastin

The https://gitlab.com/purelb/purelb project uses memberlist and one of our users is seeing this message. Do you have any advice on how to debug the cause of it? It sounds like this message indicates that UDP packets from one node to another are being dropped? Is this correct?

As far as I understand the code myself, you are correct