Public bug reported:
This issue manifests on some fresh install and update of Ubuntu 16.04.1,
clean iptables and latest version of OpenVPN (installed by Nyr's
installer - https://github.com/Nyr/openvpn-install). This bug will not
reproduce on all installs of Ubuntu 16.04.1 or 14.04.5, but is somewhat
widespread.
Only OS post-install modification on servers reproducing this bug is 1)
added sudo user, 2) changed to pub key login via ssh and 3) removed
Apache (sudo service apache2 stop + sudo apt purge --auto-remove
apache2*). Then 4) straight to downloading and running Nyr's OpenVPN
install script.
Relevant log files:
Oct 1 21:38:17 openvpnserver systemd[1]: Starting OpenVPN connection to
server...
Oct 1 21:38:17 openvpnserver systemd[1]: Starting OpenVPN service...
Oct 1 21:38:17 openvpnserver systemd[1]: Started OpenVPN service.
Oct 1 21:38:17 openvpnserver ovpn-server[229]: OpenVPN 2.3.10
x86_64-pc-linux-gnu [SSL (OpenSSL)] [LZO] [EPOLL] [PKCS11] [MH] [IPv6] built on
Feb 2 2016
Oct 1 21:38:17 openvpnserver systemd[1]: Failed to start OpenVPN connection to
server.
I setup OpenVPN across Ubuntu 14.04 and 16.04 via Nyr's OpenVPN install
script a lot of the time. OpenVPN stopped running after OS updates and
system reboots (a while ago, maybe two months). I couldn't get OpenVPN
started again immediately and I had some OpenVPN backup servers on
routers that covered, so I didn't get around to troubleshooting and
fixing it until now.
I had this issue manifesting on a fresh Ubuntu 16.04.1 running on a
Windows Azure dedicated VPS and on CrownCloud, as well as on a fresh
Ubuntu 14.04.5 and 16.04.1 on some LowEndSpirit (LES) NAT servers, but
not all of them. For LES servers it appears to be location dependent, as
LES Sweden worked (until the location was recently shut down), while
Dallas didn't.
For servers affected, commenting out the limitNPROC line in
/lib/systemd/system/openvpn@.service works as a temporary workaround.
There are similar user reports spread around the interwebs, but it is
clearly not affecting all 16.04.1 and 14.04.5 installations.
** Affects: openvpn (Ubuntu)
Importance: Undecided
Status: New
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1631104
Title:
The LimitNPROC line in /lib/systemd/system/openvpn@.service has to be
commented out in order to be able to start OpenVPN
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