Package: openvpn Version: 2.4.0-6+deb9u2 OpenVPN client in common installations tries to keep connection for infinite amount of time. But on start OpenVPN can be killed by 90s DefaultTimeoutStartSec parameter used by systemd. What can happen if electricity fails - you start server with openvpn, and after that power on your router (which is for example in another end of the building). Then OpenVPN will be shutdown by systemd and there will be no tunnel betwenn offices, because openvpn could not reach the remote server
Suggestion: Add TimeoutStartSec=0 (which is infinity) to /lib/systemd/system/openvpn-client@.service or use other means to keep openvpn in "retry-forever" mode. Alexander.
