Juju scp reports "Host key verification failed. lost connection" when transferring files between machines, although is happy to connect to them individually

juju
1

I’m having difficulty troubleshooting an error I’m receiving from the juju scp command when transferring files between machines on the same model.

$ juju scp 0:hello.txt 1:hello-txt
ERROR exit status 1 (Host key verification failed.
lost connection)

Using the --proxy option to proxy traffic via the controller doesn’t seem to help:

$ juju scp --proxy 0:hello.txt 1:hello-txt
ERROR exit status 1 (Host key verification failed.
lost connection)

I am able to conduct the transfer by injecting options directly to scp:

$ juju scp -- -3 0:hello.txt 1:hello-txt
$ echo $?
0

Any advice for diagnosing the underlying issue(s)?

2

Hey @timClicks, I am having a similar issue with the Windows client, version 2.8.1. When I try to bootstrap a new controller, the process fails with Host Key verification failure until the bootstrap operation times out. While it is retrying the connection, I am able to connect to the controller machine manually.

I think this might be a bug. I think my problem lies somewhere around here, but I doubt your process is running into this code. I have a feeling this might be some sort of regression issue. Would be nice if a DEV could chime in.

I reverted to running the “jujubox” container for now which is running the Ubuntu client, version 2.7.6. That worked without issue. I created another topic to understand why the stable PPA is only up to 2.7.6. That is what the"jujubox" container is tied to.