Currently port forwarding use as free ports any port received via java client which is calling some RHC function to get a free port. There are many ports in those so-called free ports which are under range 49152–65535. This range is declared by IANA for dynamic, private... let's call them free ports.

Problem could occur in case of getting a port number lesser than 49152 which is currently not in use, but it is registered and user could start a service using this port number. Then there could be a conflict.