Hi I have one wg endpoint which is CentOS 7.9.2009 (3.10.0-1160.71.1.el7.x86_64) with kmod-wireguard 9:1.0.20220627-1.el7_9.elrepo installed. Has about 300ish peers.
We have one, there could be more, cases of wireguard logging on the other peer (typically laptops, I've seen this happen on Mac using the app and Ubuntu) Handshake for peer 6 ... did not complete after 5 seconds, retrying (try 4) The handshake on the CentOS end never updates and of course the tunnel doesn't work on the Mac/Ubuntu laptop. To get the tunnel working again all I do is on the CentOS end remove and add the peer, and the tunnel suddenly springs to life and traffic flows normally. I've since enabled debug on the CentOS end and see a constant stream of: Handshake for peer 6 ... did not complete after 5 seconds, retrying (try 4) Since I enabled debugging ~200 different peers have logged that. Also see this - invalid address - a few times too for different peers: Handshake for peer 1809 ((invalid address)) did not complete after 5 seconds, retrying (try 5) Is this expected debug output for a setup where you have a CentOS server with peers which are all laptops? i.e. the CentOS end is trying to initiate the handshake and the laptop is off/wireguard app turned off. Is it down to some UDP traffic potentially being dropped? Some network card tweaks needed? Any help greatly appreciated