Shorewall block OpenVPN traffic out

Hi, I think You should try this scenario for checking conectivity:
-check routes on vpn client pc and nethserver:
route

-check if dns works:
ping 188.226.251.154 what response?
ping nethserver.org what response?

-check where ping goes:
mtr nethserver.org
mtr188.226.251.154

-check sysctl net.ipv4.ip_forward gives You “1”

Maybe solution is bridged insteed of routed mode on nethserver if You have only one NIC but i didn’t check that.

But it seems the problem is similar to my problem from my forgotten post:

diagnose: GUI is not creating rules properly or I miss something, any help very appreciated.

Try to post output from:
shorewall show (the ovpn2net chain and related)