(07-02-2014, 05:22 AM)soul_hun Wrote: Hello, ADAMN. Why do we need to open DMZ or Port forwarding when playing PPSSPP games with friends via Internet? Is there any way to play without doing those things?Because your firewall in the router will block anything coming from the internet to the port used by PPSSPP to receive communication data between players.
Internet is like a jungle where wild beasts are lurking around to find an open door(read: port) to anyone house(read: computer), and firewall is protecting that door (it protects you from DDoS attack)
UPNP can do automatic port forwarding (when necessary), but it's not implemented in PPSSPP yet, so you'll need to open firewall manually at the moment.
PPSSPP Multiplayer Guide: https://github.com/hrydgard/ppsspp/wiki/How-to-play-multiplayer-games-with-PPSSPP