HUGE update, a complete rewrite, uses now .NET 4.x .async/multithreading code and supports UPNP, UPNP2 and NAT-PMP. Contains complete sourcecode now!

Live support channel on Discord! https://discord.gg/82wKU5G

It's Network API independent! Its working with almost every Networking API, may it Unity UNET or Mirror or Photon or whatever!
UPnP Manager 42 makes it easy to implement automatic port forwarding directly into your game.This makes it easy for the players of your multiplayer game to host games on their own computer (think "start server")

UPnP Manager 42 abstracts all complexity of low level socket networking away from the programmer in a small, lightweight DLL. A simple to setup script provided , let you forward the ports your game is using when running in host/server mode.

UPnP Manager42 is compatible with .NET 4.0 and above which means that it works with all platforms supported by Unity.

Watch the tutorial video on YouTube to get more information.

if you have questions just join the Discord channel https://discord.gg/82wKU5G
Update 42 changes; Huge rewrite , .Net 4.x / Unity 2019.x compatible , async code, support for UPNP, Upnp2 / NAT-PMP , the Legacy UPNP Manager is still as zipfile included.