adhoc problems

[AdamN]

If you are port forwarding it manually, you probably forward the wrong ports (due to port offset calculation), that's why it's still blocked. Use UPnP to get the correct ports.

Also, if you are using VPN (such as hamachi) you don't need to forward any port, as long you're using built-in AdhocServer.
If you're using public AdhocServer such as socom.cc, the connection won't go through VPN (because most VPN doesn't have internet access), in this case, you will need port forwarding because the connection didn't go through VPN. I recommend using UPnP for automatic port-forwarding, so you won't forward the wrong ports.

You can get these kind of info at ppsspp's wiki https://github.com/hrydgard/ppsspp/wiki/...ith-PPSSPP
And please use the latest dev build from https://buildbot.orphis.net/ppsspp/ it fixes some issue