Sever joining problem

starting yesterday every time i try to server i get “Buffer overflow in net message” and everywhere i look it does not say a good way to fix it or even how to so please can someone tell me or link to something that can help.

Is it for one single server, or every server?

i get this everytime i try to join GMT so i just try reconnect then it works find try join server if you get it again try reconnect works everytime for me