Sounds like what we saw as we where testing the FMS13
Last month, Steve Romig said that FM Go 12 connections did not count to the FMS 13 "connection limit".
Last week, I actually installed FMS 13 and tested it out, finding that wasn't true. No more than 1 FM GO 12 connection. This was an annual license FMS 13.0.1 (not dev) and I'm getting bounced when I try connecting with FM Go 12.0.8 on an iPhone and FM Go 12.0.6 on an iPad.
Can anyone else empirically confirm that FM Go 12 connections count on a 13 server? Or is my configuration wrong?
Upon further review / testing it does appear that FileMaker Go 12 AND FileMaker Go 13 BOTH count toward concurrent connections. My apologizes for saying otherwise.