Each login broker must have its own port number. If you specified the same port number for both login brokers then you must change it for one. Otherwise you have a conflict in that another service is running on one of the ports and therefore the login broker can't start listening on that port. If that's the case you need to find out what the other service is, stop it and run it on a different port.
On rare occasions the broker process or parts of it are in limbo - hanging about blocking the port. If that's the case you must kill the process.
Heavy Regards, RealHeavyDude.