A Linode hosted Ubuntu 18.04 LTS server acts as a Wireguard VPN.
$ uname -r
6.0.10-x86_64-ABCNNN
Installation using https://github.com/angristan/wireguard-install is painless and works perfectly with Windows 10, iPhone, and iPad clients.
Except, of course, when it does not. Over the last 6 months or so the server has stopped working a number of times, producing errors on all clients:
2023-03-14 23:36:58.002: [TUN] [i7] Sending handshake initiation to peer 1 (n.n.n.n:51820)
2023-03-14 23:37:03.074: [TUN] [i7] Handshake for peer 1 (n.n.n.n:51820) did not complete after 5 seconds, retrying (try 2)
2023-03-14 23:37:03.074: [TUN] [i7] Sending handshake initiation to peer 1 (n.n.n.n:51820)
...
After removal and re-installation, using wireguard-install, the VPN server once again works, though with consequent reconfiguration of all clients
The remarkable thing about this is that the machine has not been manually updated nor modified in any way.
It may have been modified by the unattended-upgrades service, but there is nothing in the logs to show. Is this a plausible explanation for the VPN breakage?
As an experiment, the unattended-upgrades service has been disabled. Which may or may not be a good idea but seems to be the only way to test the hypothesis. Does the panel have any other thoughts?
Possibly related: Wireguard - no handshake
