OpenVPN connection gets lost after a minute

[Krisbe]

Hi

I'm trying to configure a OpenVPN server but encounter a problem.

When a local user logs in via OpenVPN on a client, he gets connected (authentication happens via password and certificate). But after a minute, the connection on the client is down.

Client log:

Sat Aug 23 18:07:04 2014 [vpn.xxxxx.xx] Inactivity timeout (–ping-restart), restarting
Sat Aug 23 18:07:04 2014 SIGUSR1[soft,ping-restart] received, process restarting
Sat Aug 23 18:07:06 2014 UDPv4 link local (bound): [undef]
Sat Aug 23 18:07:06 2014 UDPv4 link remote: [AF_INET]xx.xx.xx.xx:1194

Server log (system - general):

Aug 23 18:06:01 kernel: pid 81509 (openvpn), uid 0: exited on signal 11 (core dumped)
Aug 23 18:06:01 kernel: ovpns1: link state changed to DOWN

After the drop of the client, the OpenVPN service on the server is down and has to restarted manually.

Any tips / ideas?

2.1.4-RELEASE (amd64)
built on Fri Jun 20 12:59:50 EDT 2014
FreeBSD 8.3-RELEASE-p16

Thanks!
Kris