После прописывания сетей сервера и включения флажка "Включить службу OpenVPN" и нажатии на кнопку "Применить" выдаётся диалог "openvpn server start failed".

Логи на сервере:
May 27 05:33:33 ham1 openvpn[26895]: read UDPv4 [ECONNREFUSED]: Connection refused (code=111)
May 27 05:33:39 ham1 last message repeated 3 times
May 27 05:33:39 ham1 alteratord: alteratord startup succeeded
May 27 05:33:39 ham1 alteratord: alteratord startup succeeded
May 27 05:33:41 ham1 openvpn[26895]: read UDPv4 [ECONNREFUSED]: Connection refused (code=111)
May 27 05:33:52 ham1 last message repeated 5 times
May 27 05:33:53 ham1 dhcpd: DHCPREQUEST for 192.168.0.249 from 00:1c:c0:aa:c9:6b (host-248) via breth1
May 27 05:33:53 ham1 dhcpd: DHCPACK on 192.168.0.249 to 00:1c:c0:aa:c9:6b (host-248) via breth1
May 27 05:33:54 ham1 openvpn[26895]: read UDPv4 [ECONNREFUSED]: Connection refused (code=111)
May 27 05:33:56 ham1 openvpn[26895]: TLS Error: TLS key negotiation failed to occur within 60 seconds (check your network connectivity)
May 27 05:33:56 ham1 openvpn[26895]: TLS Error: TLS handshake failed
May 27 05:33:56 ham1 openvpn[26895]: TCP/UDP: Closing socket
May 27 05:33:56 ham1 openvpn[26895]: SIGUSR1[soft,tls-error] received, process restarting
May 27 05:33:56 ham1 openvpn[26895]: Restart pause, 2 second(s)
May 27 05:33:58 ham1 openvpn[26895]: IMPORTANT: OpenVPN's default port number is now 1194, based on an official port number assignment by IANA.  OpenVPN 2.0-beta16 and earlier used 5000 as the default port.
May 27 05:33:58 ham1 openvpn[26895]: WARNING: No server certificate verification method has been enabled.  See http://openvpn.net/howto.html#mitm for more info.
May 27 05:33:58 ham1 openvpn[26895]: Re-using SSL/TLS context
May 27 05:33:58 ham1 openvpn[26895]: LZO compression initialized
May 27 05:33:58 ham1 openvpn[26895]: Control Channel MTU parms [ L:1542 D:138 EF:38 EB:0 ET:0 EL:0 ]
May 27 05:33:58 ham1 openvpn[26895]: Data Channel MTU parms [ L:1542 D:1450 EF:42 EB:135 ET:0 EL:0 AF:3/1 ]
May 27 05:33:58 ham1 openvpn[26895]: Local Options hash (VER=V4): '41690919'
May 27 05:33:58 ham1 openvpn[26895]: Expected Remote Options hash (VER=V4): '530fdded'
May 27 05:33:58 ham1 openvpn[26895]: UDPv4 link local: [undef]
May 27 05:33:58 ham1 openvpn[26895]: UDPv4 link remote: 10.1.0.18:1194
May 27 05:33:58 ham1 openvpn[26895]: read UDPv4 [ECONNREFUSED]: Connection refused (code=111)


Следствием этого возможен баг #20189.