[Hagvan]

Hello, so I'm making a map with a friend and we invite our friends to play on it. When I host a server, everyone can join, but I keep receiving: "Connection failed after 4 retries". What could cause that?

[Smity]

Hello, Hagvan.
I think you didnt set your client port for yourself, Heres how to fix it.
Open Steam > goto LIBRARY > goto Games > right click on Garry's Mod > click Properties > at General tab, click on "Set Launch Options..."

Put this in the launch options "+clientport 27006-27014" (WITHOUT "")