O.K. i would like to play on-line in the HL but always being talld that server time had rune out. what should i do?
Do you mean the Server "timed out"?
If you are behind a router you need to forward UDP ports 2934 and 2935 - as page 494 of the AF manual.
How you actually do that on your router - well you would need to check the documentation.
If not you may need to let the game through your Firewall.