I´ll confirm that these ports are open, but i think they are.
If i do a "status" command line, all channels are "UP" and the sensor and the manager are in the same subnet, we dont have a firewall between them. The old Manager (6.1) is in this same subnet too. If i return the sensor the the old manager, things work, if i migrate them to the new manager, i receive the error message.
I´ll take a look at ems.log trying to get some helpful information.
Any other log that you recommend to look for?