Comment 7 for bug 1538583

I see this on master after the merge of api-command-rename.

Steps for a manual recreate:

1 - Provision two machines in AWS. Make sure that the security group opens ports 17017 and 37017.
2 - Edit config for manual provider to point to one of the machines
3 - Bootstrap and add-machine with the same command (using a juju built from master)

juju bootstrap --upload-tools --debug && juju add-machine ssh:<IP of second machine>

You will see the "connection is shut down" error.