[Harnage]

please be more specific with your problem

to me it sounds like you dont have any mods on your game.
in that case you should get the unified installer. That will get you a b-17.

or do you already have mods installed and they just dont work online?

EDIT: Never mind not having mods.(saw some of your other comments about them)

Have you tried different servers?
some dont allow mods.