Garrys mod cant see servers (white screen)

This is what shows up
rightclick on the image icon and open image in new tab

I need a possible fix
Thanks

You have tried to restart the game and restart the PC?

I have the same problem I have restarted it all and no results but when a friend invites me it says failed to join after 4 retry’s what does this mean ??

From what I can tell, it’s probably an issue with your Internet connection. I’d try looking in your firewall and allowing connections from Garry’s Mod, or try allowing these ports in your firewall.