Plugin fails to connect to container spawning jenkins slave

[grimpy]

When trying to connected to the freshly spawned slave (which is perfectly ssh-able) I get the following error message in details of new node

I also noticed the plugin adds a credentials with a random (uuid) username with a copy of the original settings ssh key and as comment 127.0.0.1. Is this normal?

[02/27/14 09:28:15] [SSH] Opening SSH connection to 127.0.0.1:49211.
java.io.IOException: There was a problem while connecting to 127.0.0.1:49211
    at com.trilead.ssh2.Connection.connect(Connection.java:818)
    at com.trilead.ssh2.Connection.connect(Connection.java:687)
    at com.trilead.ssh2.Connection.connect(Connection.java:587)
    at hudson.plugins.sshslaves.SSHLauncher.openConnection(SSHLauncher.java:1132)
    at hudson.plugins.sshslaves.SSHLauncher$2.call(SSHLauncher.java:648)
    at hudson.plugins.sshslaves.SSHLauncher$2.call(SSHLauncher.java:642)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
    at java.util.concurrent.FutureTask.run(FutureTask.java:166)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1146)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:701)
Caused by: java.io.IOException: Premature connection close
    at com.trilead.ssh2.transport.ClientServerHello.readLineRN(ClientServerHello.java:33)
    at com.trilead.ssh2.transport.ClientServerHello.<init>(ClientServerHello.java:68)
    at com.trilead.ssh2.transport.TransportManager.initialize(TransportManager.java:466)
    at com.trilead.ssh2.Connection.connect(Connection.java:758)
    ... 10 more
[02/27/14 09:28:15] [SSH] Connection closed.
[02/27/14 09:28:15] Launch failed - cleaning up connection
[02/27/14 09:28:20] [SSH] Opening SSH connection to 127.0.0.1:49211.
ERROR: Unexpected error in launching a slave. This is probably a bug in Jenkins.
java.lang.NullPointerException
    at hudson.plugins.sshslaves.SSHLauncher.pemKeyEquals(SSHLauncher.java:524)
    at hudson.plugins.sshslaves.SSHLauncher.access$000(SSHLauncher.java:126)
    at hudson.plugins.sshslaves.SSHLauncher$1.matches(SSHLauncher.java:502)
    at com.cloudbees.plugins.credentials.matchers.AllOfMatcher.matches(AllOfMatcher.java:63)
    at com.cloudbees.plugins.credentials.CredentialsMatchers.firstOrDefault(CredentialsMatchers.java:356)
    at com.cloudbees.plugins.credentials.CredentialsMatchers.firstOrNull(CredentialsMatchers.java:374)
    at hudson.plugins.sshslaves.SSHLauncher.retrieveExistingCredentials(SSHLauncher.java:489)
    at hudson.plugins.sshslaves.SSHLauncher.upgrade(SSHLauncher.java:457)
    at hudson.plugins.sshslaves.SSHLauncher.getCredentials(SSHLauncher.java:442)
    at hudson.plugins.sshslaves.SSHLauncher.openConnection(SSHLauncher.java:1133)
    at hudson.plugins.sshslaves.SSHLauncher$2.call(SSHLauncher.java:648)
    at hudson.plugins.sshslaves.SSHLauncher$2.call(SSHLauncher.java:642)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
    at java.util.concurrent.FutureTask.run(FutureTask.java:166)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1146)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:701)
[02/27/14 09:28:20] [SSH] Connection closed.
[02/27/14 09:28:20] Launch failed - cleaning up connection

[02/27/14 09:28:30] [SSH] Opening SSH connection to 127.0.0.1:49211.
ERROR: Unexpected error in launching a slave. This is probably a bug in Jenkins.
java.lang.NullPointerException
    at hudson.plugins.sshslaves.SSHLauncher.pemKeyEquals(SSHLauncher.java:524)
    at hudson.plugins.sshslaves.SSHLauncher.access$000(SSHLauncher.java:126)
    at hudson.plugins.sshslaves.SSHLauncher$1.matches(SSHLauncher.java:502)
    at com.cloudbees.plugins.credentials.matchers.AllOfMatcher.matches(AllOfMatcher.java:63)
    at com.cloudbees.plugins.credentials.CredentialsMatchers.firstOrDefault(CredentialsMatchers.java:356)
    at com.cloudbees.plugins.credentials.CredentialsMatchers.firstOrNull(CredentialsMatchers.java:374)
    at hudson.plugins.sshslaves.SSHLauncher.retrieveExistingCredentials(SSHLauncher.java:489)
    at hudson.plugins.sshslaves.SSHLauncher.upgrade(SSHLauncher.java:457)
    at hudson.plugins.sshslaves.SSHLauncher.getCredentials(SSHLauncher.java:442)
    at hudson.plugins.sshslaves.SSHLauncher.openConnection(SSHLauncher.java:1133)
    at hudson.plugins.sshslaves.SSHLauncher$2.call(SSHLauncher.java:648)
    at hudson.plugins.sshslaves.SSHLauncher$2.call(SSHLauncher.java:642)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
    at java.util.concurrent.FutureTask.run(FutureTask.java:166)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1146)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:701)
[02/27/14 09:28:30] [SSH] Connection closed.
[02/27/14 09:28:30] Launch failed - cleaning up connection

[grimpy]

Downgraden SSH slaves to version 1.6 (instead of 1.6.1) fixed it

[kei-yamazaki]

I had the same problem.
Downgraded plugin to 1.6, but it's not work.
But, version 1.5 is work.

[mamciek]

Any chance of fixing this any time soon?

[sfreire]

ai have tg same problem with random ssh credentials being created..

[ckulla]

Same problem here, downgrading helped. Hope this issue will be fixed soon.

When reading the docs I see that there should also be a "SSH Username with password" credential but I don't see it anywhere, see https://wiki.jenkins-ci.org/display/JENKINS/SSH+Slaves+plugin

[sfreire]

@ckulla , you downgraded what to which version exactly?

[magnayn]

I've bumped the ssh link to the latest version, which ought to help