I've got bf1942 original, fully updated, running on 56k and when i try to connect to an internet server it fails to connect, with and "Invalid Cd key" message.
Well, playing on 56k will be nigh-on impossible anyway. Apart from this, try entering the cd-key again. Theres an executable in the program folder somewhere, under "registration" I think. Maybe it's eareg, or something.
i had 56k when i first bought bf42 u should be able to play online just fine with 56k but now we have high speeed internet:bows: