Port forward help for GMOD

I can host games like minecraft but for some reason Garry’s Mod wont work.
I decided to port forward ports 1 - 65355 to my IP PCP and UDP so that I dont have to worry about this shit, but GMOD wont work.

27015 both should work

Also you dont want to open too many ports. Its risky.

hellokevinn, Wrong. It’s equally risky if he opens 1 or 50. Everyone can get access through the 27015 port aswell as 27000 - 27200 ports if he has those forwarded. The only thing I can think of that would be more risky of open more ports is that people has it easier to find a working one to access through.