To see if my problems with not being able to login to the 8120 console, I rebooted the server. When it comes up only 3 services are running:

gwsynk:~ # rcdatasync status
Checking for DataSync Config Engine: running
Checking for DataSync Engine: dead
Checking for DataSync Web Admin: running
Checking for DataSync Connector Manager: running

And when I try to start the engine service the prompt

gwsynk:~ # rcdatasync-syncengine start
Starting DataSync Engine

hangs for "ever"

I think I'm skilled enough to to do the installation properly, since I've been in this since the first tech preview and have followed the guide created by Danita Zanr strictly all the time. But still the 81-release is not starting properly!