Based on the text created by Alberto plus some minor rewordings: openvpn ======= Backup your secret key files. While key names are arbitrary, the can be detected by running grep secret /etc/openvpn/*.conf Recreate them using openvpn --genkey --secret SECRET_FILENAME. Then copy the shared secret keys to the remote hosts and restart the VPN on each host with /etc/init.d/openvpn force-reload