I'm using a pubkey that was added to my user account. I'll give password a try

(Edited: nevermind, wrong context)

Hmm, I can't even manage to get the ssh server to prompt me for a password at all. It seems like it's only willing to do key authentication.

Okay, I wasn't sure. I'll try to figure this out this week.

Thanks!

After upgrading to 2.3 we are hitting this same issue. Some things that are worth noting:

• Issue seems intermittent (can't reproduce consistently)
• We are using Jenkins 2.3 and breakage started by upgrading to 2.3
• Our stacktrace looks the same
• It happens even if the build is successful, at the very end:

Archiving artifacts
FATAL: org.acegisecurity.providers.UsernamePasswordAuthenticationToken cannot be cast to org.jenkinsci.plugins.GithubAuthenticationToken
java.lang.ClassCastException: org.acegisecurity.providers.UsernamePasswordAuthenticationToken cannot be cast to org.jenkinsci.plugins.GithubAuthenticationToken
at org.jenkinsci.plugins.GithubSecurityRealm.loadUserByUsername(GithubSecurityRealm.java:644)
at hudson.model.User$UserIDCanonicalIdResolver.resolveCanonicalId(User.java:1048)
at hudson.model.User.get(User.java:394)
at hudson.model.User.get(User.java:363)
at hudson.plugins.git.GitChangeSet.findOrCreateUser(GitChangeSet.java:374)
at hudson.plugins.git.GitChangeSet.getAuthor(GitChangeSet.java:435)
at hudson.model.AbstractBuild.getCulprits(AbstractBuild.java:350)
at hudson.model.AbstractBuild.getCulprits(AbstractBuild.java:346)
at hudson.model.AbstractBuild$AbstractBuildExecution.post(AbstractBuild.java:672)
at hudson.model.Run.execute(Run.java:1763)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
at hudson.model.ResourceController.execute(ResourceController.java:98)
at hudson.model.Executor.run(Executor.java:410)
Finished: FAILURE

See also JENKINS-34775, for the breakage caused by the fix for SECURITY-243.

This is going to require someone to patch who is more expert than I at development. To date I've mostly just merged other people's pull requests and made releases (though I have made minor improvements here and there).

Hopefully, someone is willing to step up and contribute a fix. I'll work on it when I can but I imagine it will take a huge time investment from me (more than I have). Though, if a fix is proposed I have no problem reviewing it, merging, and releasing.

reportedly fixed in 0.24.

Based on James Nord's comment.