Vagrant - master branch failed at "restart openvpn" - succeeds after reboot

[jmcgnh]

RUNNING HANDLER [vpn : restart openvpn] ****************************************
fatal: [jessie]: FAILED! => {"changed": false, "failed": true, "msg": "Job for openvpn@server.service failed. See 'systemctl status openvpn@server.service' and 'journalctl -xn' for details.\n"}

Doing "vagrant halt" followed by "vagrant up --provision" gets through to the end.

[jmcgnh]

Here's what it said in /var/log/syslog on the vagrant system in relation to the above error.

Oct 9 06:59:53 sovereign systemd[1]: Stopped OpenVPN connection to server.
Oct 9 06:59:53 sovereign systemd[1]: Starting system-openvpn.slice.
Oct 9 06:59:53 sovereign systemd[1]: Created slice system-openvpn.slice.
Oct 9 06:59:53 sovereign systemd[1]: Starting OpenVPN connection to server...
Oct 9 06:59:53 sovereign ovpn-server[24879]: OpenVPN 2.3.4 x86_64-pc-linux-gnu [SSL (OpenSSL)] [LZO] [EPOLL] [PKCS11] [MH] [IPv6] built on Nov 12 2015
Oct 9 06:59:53 sovereign ovpn-server[24879]: library versions: OpenSSL 1.0.1t 3 May 2016, LZO 2.08
Oct 9 06:59:53 sovereign ovpn-server[24879]: Diffie-Hellman initialized with 2048 bit key
Oct 9 06:59:53 sovereign ovpn-server[24879]: Control Channel Authentication: using 'ta.key' as a OpenVPN static key file
Oct 9 06:59:53 sovereign ovpn-server[24879]: Outgoing Control Channel Authentication: Using 512 bit message hash 'SHA512' for HMAC authentication
Oct 9 06:59:53 sovereign ovpn-server[24879]: Incoming Control Channel Authentication: Using 512 bit message hash 'SHA512' for HMAC authentication
Oct 9 06:59:53 sovereign ovpn-server[24879]: WARNING: normally if you use --mssfix and/or --fragment, you should also set --tun-mtu 1500 (currently it is 1300)
Oct 9 06:59:53 sovereign ovpn-server[24879]: Socket Buffers: R=[212992->212992] S=[212992->212992]
Oct 9 06:59:53 sovereign ovpn-server[24879]: ROUTE_GATEWAY 10.0.2.2/255.255.255.0 IFACE=eth0 HWADDR=08:00:27:ef:c8:29
Oct 9 06:59:53 sovereign kernel: [ 3778.181280] tun: Unknown symbol __sk_attach_filter (err 0)
Oct 9 06:59:53 sovereign kernel: [ 3778.181385] tun: Unknown symbol __sk_detach_filter (err 0)
Oct 9 06:59:53 sovereign ovpn-server[24879]: ERROR: Cannot open TUN/TAP dev /dev/net/tun: No such device (errno=19)
Oct 9 06:59:53 sovereign ovpn-server[24879]: Exiting due to fatal error
Oct 9 06:59:53 sovereign systemd[1]: openvpn@server.service: control process exited, code=exited status=1
Oct 9 06:59:53 sovereign systemd[1]: Failed to start OpenVPN connection to server.
Oct 9 06:59:53 sovereign systemd[1]: Unit openvpn@server.service entered failed state.