[V415]

100% positive, we've had people try everything in the book with us, we managed to get them blocked at the network level rather than the local box and it's blocking them now but this is what we see in the logs:

I've removed the guys last 2 octets but this is an example of the log data when they try to connect as an existing player.

Line 16299: [06/11/2013 01:41:04] (1) Invalid client connecting from 41.96.x.x
Line 16315: [06/11/2013 01:41:04] Invalid client connecting from 41.96.x.x
Line 16318: [06/11/2013 01:41:04] [join] Harry_Poter has joined the server (1:41.96.x.x)
Line 16357: [06/11/2013 01:41:16] Incoming connection: 41.96.x.x:50008
Line 16361: [06/11/2013 01:41:17] [join] Harry_Poter has joined the server (6:41.96.x.x)
Line 16504: [06/11/2013 01:42:57] Incoming connection: 41.96.x.x:50028
Line 16506: [06/11/2013 01:42:58] [join] Harry_Poter has joined the server (6:41.96.x.x)