There isn't usually a password for the server unless the campaign is running. The Storm of War campaign is very popular and so the chaps who run it password protect it to make sure only those pilots registered can get in (about 75 slots at the mo). The multiplayer campaign runs saturday & sunday at 8pm GMT - any other time the server runs without a password.
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for info about the multiplayer campaign visit http://sowc.forumotion.co.uk/]