counter-strike online, acces problem ??

I am trying to get counter-strike 1.6 working under Vista.

I can run steam and the program without any problems. I can make a local
game of counter-strike and play no problemes.

But when I connect to a online server I get problemes. I join the server
connection is established. Progress bar is showing and when it gets to
precaching resources it dies. Nothing happens for some time and I end up with
a connection timed out

Would really appriciate any help on this.

I am runing fully updated steam on Vista RC1.