OpenVPN closes on inactivity

Hi Merlin,

i have AC56U with latest stable 378.55.

I'm using an OpenVPN as Client, and when there are no activity for some time (dont know how much) it disconnects it.

Here are the part of log:
Oct 22 14:41:42 dnsmasq-dhcp[445]: DHCPACK(br0) 192.168.1.204 a8:a6:68:cd:82:1b android-eaacc2eae8ead2d7
Oct 22 14:43:29 openvpn[3631]: [MyVPN Connection] Inactivity timeout (--ping-exit), exiting
Oct 22 14:43:30 openvpn[3631]: vpnrouting.sh tun11 1500 1542 10.200.0.226 10.200.0.225 init
Oct 22...

OpenVPN closes on inactivity