ttt.fadw.net

You essentially have three options for connecting to the server From A Different World "Trouble in Terrorist Town" (2021 edition) directly - pick one:

1. Click the following link, which prompts the Steam client to connect for you: steam://connect/ttt.fadw.net
2. Open the Steam server browser (Steam client -> View -> Servers), go to Favorites and add ttt.fadw.net
3. Open Garry's Mod and the in-game developer console and type: connect ttt.fadw.net