iptables rules for ohnet

[gillecaluim]

Trying to get iptables rules working for minimserver on arch linux x86_64 server.
Running minimserver-0.8.4 without problems with ohnet.subnet = 10.20.30.0.
Running minimwatch on win10pro laptop on same ohnet.subnet....but it can't connect (ie stays gray) unless I allow all traffic from the server to that subnet. I can browse to the minimserver http 9790 from the laptop so that works.
Is there a destination port range that the ohnet upnp stack uses that I should allow in the iptables output chain? I can see multiple dropped udp packets in the iptables log