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I'm quite good at it but always played alone and don't know anybody who own the game^^ so...
I've seen somewhere that you have to open 17010 17011 17012 6667 and 1007 in TCP/UDP
I'm not sure you have to open all of the 5 ports but it works for me
https://worms2d.info/Hosting_Guide
Automatic: Universal Plug and Play (UPnP)
If your router supports UPnP (an automatic way for programs and devices to communicate how to route incoming connections), you could try enabling it in your router's settings. W:A supports this and will try to automatically forward the right port for hosting if "Forward with UPnP" is enabled in the network configuration menu (main menu -> network play (bottom-left) -> "Configuration"). If this doesn't work for you, read on for the manual method.