@ Woodstock and Oddball : This occured on ATAG server 1 aswell and was fixed by Bliss shortly after..I guess noone noticed the same bug crept into ATAG2 aswell up till now.
@IvanK : The fix is waiting till the server itself restarts and releases all Steam ID's. As I understsand it's something to do with CLOD not releasing the ID's when you have a failure while connecting is in progress or if you cancel connecting as it's busy.
So don't ever cancel while the loading bar is showing or you will be locked out of that server till a restart!
It's the reason ATAG restarts every X hours and also that passworded servers end up showing high playernumbers after a while even if noone is on them. People try connect ,don't know the password so disconnect again..which adds 1 more to the playercount in the lobby.
Quite a horible bug and one that should have been fixed long ago.
http://www.il2bugtracker.com/issues/228