https://youtu.be/DnEw7c1Ozh8

There will be a proper anticheat in the next update.
To ban players use IW4MAdmin, check the documentation for instructions on how to install and use it:
https://github.com/RaidMax/IW4M-Admin/blob/2.4-pr/README.md

bro revive plz i got music

https://www.youtube.com/watch?v=DMlCLw4aCqA

also yt embedding plz admin

Try setting your headset as default output device in the windows sound settings.
Also make sure to plug in your headset before starting the game.

You shouldn't use DMZ. Make sure you're actually in the game (not sitting in the pre-game lobby), you can start the match by typing "xpartygo" into the console.
Also it's ip:port (e.g. "connect 143.212.42.21:4976").
If it still doesn't work post a screenshot of your port forwarding settings.

Guess it's time for me to finally buy that game eh

https://www.youtube.com/watch?v=C-hk_AdHXRc

https://youtu.be/8DthSsph5BU