Agent Errors (such an old issue)

Alright I've played this game a few years and I've been on this server for 2. I quit a while back but I am wanting to play again now but the thing is, whenever I play this particular server (and a few others), I get a thing called Agent Errors when I log in to a match. Everyone has either 0 or 999 ping and is not moving while I can move around. I can see that people are getting kills etc but I can't do anything. It's very frustrating. I would like to know the solution to this. I've been told by people the solution is Port Forwarding but nobody has told me ports or anything of the sort so if anyone has the actual solution, please, and I mean it when I say this, please tell me how, I love GunZ, great game.

Thanks.
Pp.

https://freestylersworld.com/showthre...-To-Fix-NAT-AE
Port 7700-7800