With DayZ 1.13.* BattlEye RCon now properly accepts the RConPort parameter. However, if omitted a random port is chosen, which will cause a lot of confusion and break a lot of current server setups.
Additionally, you can no longer define the game port or BattlEye port (game port + 2) as RCon port, which will cause even more confusion and require manual intervention on all servers currently using any RCon tools.