$ juju --debug ssh shard1
2015-11-18 20:07:23 INFO juju.cmd supercommand.go:58 running juju [1.26-alpha2 gc]
2015-11-18 20:07:23 DEBUG juju.api api.go:155 trying cached API connection settings - endpoints [[2601:400:8000:341a:216:3eff:fed0:f3eb]:17070 192.168.15.139:17070]
2015-11-18 20:07:23 INFO juju.api api.go:267 connecting to API addresses: [[2601:400:8000:341a:216:3eff:fed0:f3eb]:17070 192.168.15.139:17070]
2015-11-18 20:07:23 INFO juju.api apiclient.go:473 dialing "wss://[2601:400:8000:341a:216:3eff:fed0:f3eb]:17070/environment/21cc862a-4cec-4142-8576-cbcfceb5fd47/api"
2015-11-18 20:07:23 INFO juju.api apiclient.go:266 connection established to "wss://[2601:400:8000:341a:216:3eff:fed0:f3eb]:17070/environment/21cc862a-4cec-4142-8576-cbcfceb5fd47/api"
2015-11-18 20:07:23 DEBUG juju.api api.go:484 API hostnames unchanged - not resolving
2015-11-18 20:07:23 DEBUG juju.api api.go:514 cacheChangedAPIInfo: serverUUID="21cc862a-4cec-4142-8576-cbcfceb5fd47"
2015-11-18 20:07:23 DEBUG juju.cmd.juju ssh.go:183 proxy-ssh is true
2015-11-18 20:07:23 DEBUG juju.utils.ssh ssh.go:249 using OpenSSH ssh client
Warning: Permanently added '2601:400:8000:341a:216:3eff:fed0:f3eb' (ECDSA) to the list of known hosts.
nc: getaddrinfo: Name or service not known
ssh_exchange_identification: Connection closed by remote host
2015-11-18 20:07:23 INFO cmd supercommand.go:454 command finished