Hello,
About the whitelist (it's a new stuff in farcry that allow to the admins to do the filter to allowed who can join or not into their servers, the goal of this is... to prevent some kind of players, such as those that do crash the servers or use cheaters in game).
How it's works?...
Answer: Once you try join in a server for the first time and your GUID don't figure into the whitelist files then you will get auto kicked by the server game and then you will be auto registred into the unlisted players logs on the game server, until some server admin add your GUID into the trusted players list (whitelist), once you are in this list then you'll allowed to join in this server at any time as you wish!
* The server admins are always looking into the unlisted players logs, to see who is who and then give or not the permission to join into their servers, so... basicly you don't need do nothing to get the approval from any admin, just keep try join into the server after some (few: seconds/minutes or hours) to see if some server admin have add you into their whitelist!
BTW... I am one of the admins of the FWL servers... See you in battlefield!![]()