Update: 17:40 - Turns out the problem isn't with the update, Minecrafts legacy login servers are down, as soon as Mojang resolve that I'll test the update and another patch I was about to apply when it went down and will get the server back up asap!
Update: 18:10 - The Mojang server is back up and we've almost finished testing already, the server will reopen any minute!
Update: 18:13 - The whitelist has been removed!