Can't load game -MP

[metal000]

Hello
Recently i encountered a problam with the game,when i try to enter a game so it start's loading and the line
gets filled red and then it gets to caching entities....but never goes through it...just stuck there and i can't play multiplayer.
I can wait hours it it just won't finish!
singleplayer works just fine....
i don't get it,my computer is totaly fine,and it stands the system requerments.
What is the problam?
Please help,i want to play multiplayer