Juju controller issues

Hey Folks… we’re having a really weird juju controller issue… when the controller comes up… and jujud-machine-0 starts… it restarts juju-db … waits a bit… then fails with:

ERROR juju.worker.dependency engine.go:676 "api-caller" manifold worker returned unexpected error: [625418] "machine-0" cannot open api: unable to connect to API: dial tcp connect: connection refused

and it basically just does this over and over every 30’ish seconds…

Can someone give me some clues on how to troubleshoot this?