Very strange issue with a common and popular server

I seem to not be able to connect to this IP
My friends can join, There are other people on the server.
But for some odd reason I am being singled out and made unable to join the server.
Every time I try and join I get the Steam grey box and a “Server is not Responding”.
I don’t know whats going on, this only started happening today and I play on the server often. Help me out Please

Can you join other servers? If so, try connecting via Console(~) and type the commend: