Same issue, need someone's help. UPnP was working a few months ago, and now that I came back into Arma it won't work anymore. I have automatic UPnP set and my prots 2302-2306 are already open. Tried resetting Firewall's rules (outbound and inbound) to see if any recent update had f*ed up stuff, but nothing changed. While hosting, the automatic upnp list shows that is using the ports (2302, 2303,. 2304 and 2306 on UDP). Please help.