On Wed, 13 Feb 2013 01:36:52 -0800 (PST)
Gabby Romano <omerik...@gmail.com> wrote:

> I hope it's the right place for this kind of issues, but since I
> didn't find a solution elsewhere, I thought to give it a try.
> I am trying to switch to an ssh URL instead of HTTP based one in the
> git plugin under Jenkins. whenever I am doing this and trying to run
> a git hook which does polling, I am getting this error:
> Fetching changes from the remote Git repositories
> Fetching upstream changes from ssh://git@<repo URL>
> ERROR: Problem fetching from origin / origin - could be unavailable.
> Continuing anywayhudson.plugins.git.GitException
> <http://stacktrace.jenkins-ci.org/search?query=hudson.plugins.git.GitException>:
> Command "/usr/bin/git fetch -t ssh://git@<repo URL>
> +refs/heads/*:refs/remotes/origin/*" returned status code 128:
> stdout: stderr: Host key verification failed. fatal: The remote end
> hung up unexpectedly
>       at hudson.plugins.git.GitAPI.launchCommandIn(GitAPI.java:897)
>       at hudson.plugins.git.GitAPI.launchCommand(GitAPI.java:858)
>       at hudson.plugins.git.GitAPI.fetch(GitAPI.java:200)
>       at hudson.plugins.git.GitAPI.fetch(GitAPI.java:1105)
>       at hudson.plugins.git.GitSCM.fetchFrom(GitSCM.java:813)
>       at hudson.plugins.git.GitSCM.access$100(GitSCM.java:72)
>       at hudson.plugins.git.GitSCM$1.invoke(GitSCM.java:744)
>       at hudson.plugins.git.GitSCM$1.invoke(GitSCM.java:731)
>       at hudson.FilePath$FileCallableWrapper.call
> (FilePath.java:2236) at hudson.remoting.UserRequest.perform
> (UserRequest.java:118) at hudson.remoting.UserRequest.perform
> (UserRequest.java:48) at hudson.remoting.Request$2.run
> (Request.java:326) at hudson.remoting.InterceptingExecutorService
> $1.call(InterceptingExecutorService.java:72) at
> java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334) at
> java.util.concurrent.FutureTask.run(FutureTask.java:166) at
> java.util.concurrent.ThreadPoolExecutor.runWorker
> (ThreadPoolExecutor.java:1110) at
> java.util.concurrent.ThreadPoolExecutor$Worker.run
> (ThreadPoolExecutor.java:603) at java.lang.Thread.run
> (Thread.java:722) Polling for changes in Done. Took 0.25 sec Changes
> found
> I tried increasing the MaxStartups attribute in sshd_config but it
> didn't help.git version used is  
> any idea what could be the cause of this ?

The "Host key verification failed." message from an SSH client usually
means that the SSH key on the server has changed.  The security of
the SSH protocol rests in trusting the server's key -- that's why SSH
clients insist on verifying and accepting the server's key (showing you
its fingerprint) when you connect to a server for the first time.
Then the accepted key is typically cached, and next time you connect
to that same server (using the same hostname!) your SSH client checks
to see the fingerprint of the key presented by the server matches the
cached one for that server, and if the server's key suddenly changes,
the SSH client assumes a possibility of the MitM attack and refuses to

I'm not quite sure what you're doing in your particular case (I mean,
on which side the SSH client is failing, and the matter is further
complicated by the fact some Java program is involved in the process
(I recall Hudson is something like a CI server, right?)).
But I think I gave you some clue for further research.

For OpenSSH, you usually use `ssh-keygen -R <hostname>` to remove the
cached entry for the server <hostname>.
For PuTTY, it's a matter of deleting an appropriate entry from

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