Cant See Gmod Servers/Crashes shortly after Joining Game

Basically, when I got to find multiplayer game, it shows nothing in the white box compared to usually it appears with servers (DarkRP, TTT, ect…) Usually when I get an invite, it says the server is not responding but occasionally it will allow me to join. After around 5 minutes of being in the game, everything freezes but I can still here people talking. I dont know if these are to seprate issues or not but help will be appriciated. Thanks.

One. your firewall is blocking garrys mod. 2. if that doesnt help ill tell you another thing. i have the same problem but i disconnect right away