Simon,

The setup I have is running two OpenVPN daemons on the same port (1618)
but on different protocols (TCP/UDP). The post that Chris made in the
AWS forum above had a much simpler, single virtual interface setup.

root@ip-10-0-0-9:~# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group 
default qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9001 qdisc pfifo_fast state UP 
group default qlen 1000
    link/ether 06:cc:43:0f:66:e9 brd ff:ff:ff:ff:ff:ff
    inet 10.0.0.9/28 brd 10.0.0.15 scope global eth0
       valid_lft forever preferred_lft forever
    inet6 fe80::4cc:43ff:fe0f:66e9/64 scope link
       valid_lft forever preferred_lft forever
3: tun0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast 
state UNKNOWN group default qlen 100
    link/none
    inet 10.255.248.1/23 brd 10.255.249.255 scope global tun0
       valid_lft forever preferred_lft forever
4: tun1: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast 
state UNKNOWN group default qlen 100
    link/none
    inet 10.255.250.1/23 brd 10.255.251.255 scope global tun1
       valid_lft forever preferred_lft forever



root@ip-10-0-0-9:~# ip route
default via 10.0.0.1 dev eth0
10.0.0.0/28 dev eth0  proto kernel  scope link  src 10.0.0.9
10.255.248.0/23 dev tun0  proto kernel  scope link  src 10.255.248.1
10.255.250.0/23 dev tun1  proto kernel  scope link  src 10.255.250.1


root@ip-10-0-0-9:~# netstat -nlp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       
PID/Program name
tcp        0      0 0.0.0.0:1618            0.0.0.0:*               LISTEN      
2875/openvpn
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      
1059/sshd
tcp6       0      0 :::22                   :::*                    LISTEN      
1059/sshd
udp        0      0 0.0.0.0:68              0.0.0.0:*                           
876/dhclient
udp        0      0 0.0.0.0:1618            0.0.0.0:*                           
2874/openvpn
Active UNIX domain sockets (only servers)
Proto RefCnt Flags       Type       State         I-Node   PID/Program name    
Path
unix  2      [ ACC ]     STREAM     LISTENING     8782     1/init              
/run/lvm/lvmpolld.socket
unix  2      [ ACC ]     STREAM     LISTENING     20818    2974/systemd        
/run/user/1000/systemd/private
unix  2      [ ACC ]     SEQPACKET  LISTENING     8864     1/init              
/run/udev/control
unix  2      [ ACC ]     STREAM     LISTENING     8783     1/init              
/run/systemd/journal/stdout
unix  2      [ ACC ]     STREAM     LISTENING     9033     1/init              
/run/lvm/lvmetad.socket
unix  2      [ ACC ]     STREAM     LISTENING     10909    1/init              
/run/acpid.socket
unix  2      [ ACC ]     STREAM     LISTENING     20850    3012/0              
/tmp/ssh-zhPNN6x7d9/agent.3012
unix  2      [ ACC ]     STREAM     LISTENING     10899    1/init              
/run/snapd.socket
unix  2      [ ACC ]     STREAM     LISTENING     10824    1/init              
/var/run/dbus/system_bus_socket
unix  2      [ ACC ]     STREAM     LISTENING     10891    1/init              
/run/uuidd/request
unix  2      [ ACC ]     STREAM     LISTENING     10893    1/init              
/var/lib/lxd/unix.socket
unix  2      [ ACC ]     STREAM     LISTENING     13922    1074/iscsid         
@ISCSIADM_ABSTRACT_NAMESPACE
unix  2      [ ACC ]     STREAM     LISTENING     17650    1/init              
/var/run/pcscd/pcscd.comm
unix  2      [ ACC ]     STREAM     LISTENING     8778     1/init              
/run/systemd/private

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https://bugs.launchpad.net/bugs/1580356

Title:
  OpenVPN causes reboot failure on Xenial in AWS

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