OpenVPN routing and Plesk firewall

[JANSEO]

Dear Parallels Support,

I am trying to install an OpenVPN server on a CentOS with Plesk 12.0.8 server however I am unable to add the required iptables routing rules beause of the automated iptables management of Plesk.

I need to add the following rule:

iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -o eth0 -j MASQUERADE

Is it possible to add this rule or enable internet access to a OpenVPN server with Plesk Firewall?

Best Regards,
Jan