We've had a few cases where we found WireGuard unexpectedly
deactivated on company laptops at employee homes. Upon review of the
logs, it looks like DNS resolution failed for an extended time during
startup, and the service eventually gave up:

2021-01-24 15:23:08.253716: [TUN] [SCJ] Watching network interfaces
2021-01-24 15:23:08.287522: [TUN] [SCJ] Resolving DNS names
2021-01-24 15:23:08.324339: [TUN] [SCJ] Host not found when resolving
a.redacted.host.name, but no Internet connection available, sleeping
for 4 seconds
2021-01-24 15:23:08.481848: [MGR] Update checker: The server name or
address could not be resolved
2021-01-24 15:23:12.336376: [TUN] [SCJ] Host not found when resolving
a.redacted.host.name, but no Internet connection available, sleeping
for 4 seconds
...
2021-01-24 15:25:40.566827: [TUN] [SCJ] Host not found when resolving
a.redacted.host.name, but no Internet connection available, sleeping
for 4 seconds
2021-01-24 15:25:44.567990: [TUN] [SCJ] Host not found when resolving
a.redacted.host.name, but no Internet connection available, sleeping
for 4 seconds
2021-01-24 15:25:48.571438: [TUN] [SCJ] Unable to resolve one or more
DNS hostname endpoints: No such host is known.
2021-01-24 15:25:48.572667: [TUN] [SCJ] Shutting down
2021-01-24 15:25:48.576621: [MGR] [SCJ] Tunnel service tracker finished

I suspect this is due to the laptop lacking internet access for some
time after its been turned on. Some staff connect over mobile hotspots
and some have poor WiFi within the home. It looks like the laptops
later gain an internet connection, but the tunnel is left in its
deactivated state until someone intervenes.

I've attached logs from two different computers that seem to have
encountered this. Both are running WireGuard for Windows 0.3.4. If
you'd like an unredacted copy of the logs I'd be happy to send them
along off-list.

If this is working as intended we'll create some sort of separate
governor to monitor tunnel health. I figured I should raise the issue
in case the DNS resolution retry/backoff policy should be revisited.

Thanks!

Joshua Sjoding
SCJ Alliance
IT Specialist
www.scjalliance.com