discord.gg/kd2aRzp

I'm not updating this guide anymore but there is a discord group so I'm sure they can help you there. Just use the above link.

If you want to join a game then first you will have to select "Multiplayer" from the main menu. If you are joining a game over the internet then make sure you click on the internet tab near the top of the screen as seen here:

Then you should type in the IP Address of the host you are trying to connect to into the IP box as seen here:

After that click the "Add" button to the right of the IP box and then click "Join Game" in the bottom right corner of the screen.

If you want to be able to host a game online then you will have to do some port forwarding on your router. Every router is different so you are going to have to figure out for yourself how that works, you can try checking any manuals that came with your router or checking some guides on the internet such as this one[portforward.com] (which interestingly enough has specific guides for which ports to open for Ghost Recon).

Once you have figured out how to forward ports on your router you will then have to forward the ports 2346 to 2348 on both UDP and TCP for the local IP that your computer is using.

Once you have done all that boot up Ghost Recon, go to the Multiplayer menu and click the "Create Game" up at the top left corner of the screen. There, you have now created a joinable lobby. To get other people to join you have to give them your public IP. You may notice Ghost Recon displaying a message that says "You IP Address is: (some numbers)", that is the wrong IP address so don't give people that one. A very easy way to find out your public IP is to just simply google search "my ip"[www.google.com]. Take that number and give that to anyone who wants to join your game.

This section is for people who are playing on a Local Area Network, this is if you are physically located in the same room as who you are trying to play with or if you and your friends have some kind of VPN program like Hamachi or Tunngle connecting you together.

Joining a game is as simple as getting into the multiplayer menu, making sure you are on the LAN tab as seen in the following picture:
Then you just click on the server name and then click join game in the bottom right corner of the screen.

Hosting on LAN is even more simple, click "Create Game" in the top left corner of the screen. That's it.