Be aware that with Win 7 x64 and RDC 8.1 (KB2830477
) installed connections to a RDS Connection Broker from outside your LAN will not get through.
I'm struggling this this problem at the moment and hope to garner some attention from MS regarding this matter.
All internal connections to our broker are properly redirected.
All external connections to our broker are handed the proper destination server but never try to reconnect.
I suspect this problem is already embedded with Windows 8.1 and any prior version with the KB I listed about installed.