Sets the specified incoming port.
PRL_RESULT PrlPortFwd_SetIncomingPort( PRL_HANDLE hPortFwd, PRL_UINT16 nIncomingPort );
PrlApiNet.h
PRL_RESULT. Possible values:
PRL_ERR_INVALID_ARG - invalid handle or null pointer was passed.
PRL_ERR_SUCCESS - function completed successfully.