When I used a fresh Edison, I could register it without any problem. I'm not sure if the problem I observed above was due to the particular Edison's OR network / cloud side.
I will continue to look into it, as I plan to use a bunch of them. But, this case is closed for now.
I have same problem!!
oot@samjin:~# iotkit-admin test
2015-04-24T07:54:57.091Z -: Trying to connect to host ...
2015-04-24T07:54:57.600Z -: Data Submission Error code=ECONNRESET
2015-04-24T07:54:57.607Z -: Connection failed to dashboard.us.enableiot.com