com.jcraft.jsch.JSchException

tip

Ant scp task has an attribute called trust. If set to false (default) the host you connect to has to be set in the knownhosts file (you might have to create it) Another way is to explicitly set "trust = true". Check the documentation: https://goo.gl/G5680x

You have a different solution? A short tip here would help you and many other users who saw this issue last week.

  • SSH plugin throws auth cancel with simplest configuration. On my jenkins server I can ssh to target machine using keys without passphrase. When I add SSH location using SSH Plugin this consistently fails with message below. {code}Started by user Onno van der Straaten Building in workspace .. repository executing script: ls [SSH] Exception:Auth cancel com.jcraft.jsch.JSchException: Auth cancel at com.jcraft.jsch.Session.connect(Session.java:451) at com.jcraft.jsch.Session.connect(Session.java:150) at org.jvnet.hudson.plugins.SSHSite.createSession(SSHSite.java:118) at org.jvnet.hudson.plugins.SSHSite.executeCommand(SSHSite.java:128) at org.jvnet.hudson.plugins.SSHBuilder.perform(SSHBuilder.java:60) at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:19) at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:814) at hudson.model.Build$BuildExecution.build(Build.java:199) at hudson.model.Build$BuildExecution.doRun(Build.java:160) at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:593) at hudson.model.Run.execute(Run.java:1568) at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46) at hudson.model.ResourceController.execute(ResourceController.java:88) at hudson.model.Executor.run(Executor.java:237) Build step 'Execute shell script on remote host using ssh' marked build as failure Finished: FAILURE{code} On target machine /var/log/messages shows each time {code}Apr 3 08:26:13 mymachine sshd[12009]: Received disconnect from (ip): 3: com.jcraft.jsch.JSchException: Auth cancel{code}
    via by Onno van der Straaten,
  • SSH plugin throws auth cancel with simplest configuration. On my jenkins server I can ssh to target machine using keys without passphrase. When I add SSH location using SSH Plugin this consistently fails with message below. {code}Started by user Onno van der Straaten Building in workspace .. repository executing script: ls [SSH] Exception:Auth cancel com.jcraft.jsch.JSchException: Auth cancel at com.jcraft.jsch.Session.connect(Session.java:451) at com.jcraft.jsch.Session.connect(Session.java:150) at org.jvnet.hudson.plugins.SSHSite.createSession(SSHSite.java:118) at org.jvnet.hudson.plugins.SSHSite.executeCommand(SSHSite.java:128) at org.jvnet.hudson.plugins.SSHBuilder.perform(SSHBuilder.java:60) at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:19) at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:814) at hudson.model.Build$BuildExecution.build(Build.java:199) at hudson.model.Build$BuildExecution.doRun(Build.java:160) at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:593) at hudson.model.Run.execute(Run.java:1568) at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46) at hudson.model.ResourceController.execute(ResourceController.java:88) at hudson.model.Executor.run(Executor.java:237) Build step 'Execute shell script on remote host using ssh' marked build as failure Finished: FAILURE{code} On target machine /var/log/messages shows each time {code}Apr 3 08:26:13 mymachine sshd[12009]: Received disconnect from (ip): 3: com.jcraft.jsch.JSchException: Auth cancel{code}
    via by Onno van der Straaten,
  • Algorithm negotiation fail in Jenkins
    via Stack Overflow by Ehsan Enayati
    ,
  • Hello, Today I faced an issue involving SSH with my Jenkins, the error is as follow: [SSH] Exception:Algorithm negotiation fail *com.jcraft.jsch.JSchException: Algorithm negotiation fail* *at com.jcraft.jsch.Session.receive_kexinit(Session.java:520)* at com.jcraft.jsch.Session.connect(Session.java:286) at com.jcraft.jsch.Session.connect(Session.java:150) at org.jvnet.hudson.plugins.SSHSite.createSession(SSHSite.java:141) at org.jvnet.hudson.plugins.SSHSite.executeCommand(SSHSite.java:151) at org.jvnet.hudson.plugins.SSHBuilder.perform(SSHBuilder.java:60) at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20) at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:770) at hudson.model.Build$BuildExecution.build(Build.java:199) at hudson.model.Build$BuildExecution.doRun(Build.java:160) at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:533) at hudson.model.Run.execute(Run.java:1759) at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43) at hudson.model.ResourceController.execute(ResourceController.java:89) at hudson.model.Executor.run(Executor.java:240) This error happened because my OpenSSH version just upgraded from 6.6 to 6.7 (as most debian jessie users), in the [OpenSSH changelog|http://www.openssh.com/txt/release-6.7] you can clearly see "The default set of ciphers and MACs has been altered to remove unsafe algorithms". OpenSSH 6.7 default key exchange algorithms: * curve25519-sha256@libssh.org * ecdh-sha2-nistp256 * ecdh-sha2-nistp384 * ecdh-sha2-nistp521 * diffie-hellman-group-exchange-sha256 * diffie-hellman-group14-sha1 Unfortunately ssh-credentials rely on JSch which use *diffie-hellman-group-exchange-sha1* and *diffie-hellman-group1-sha1* for key exchange, and those algorithms are no longer part of OpenSSH default key exchange algos. Since version 0.1.49 JSch support *diffie-hellman-group-exchange-sha256*. I would suggest to update ssh-credentials dependency to rely on JSch 0.1.49, so everybody feel up to date and secure.
    via by theo .,
    • com.jcraft.jsch.JSchException: Auth cancel at com.jcraft.jsch.Session.connect(Session.java:451) at com.jcraft.jsch.Session.connect(Session.java:150) at org.jvnet.hudson.plugins.SSHSite.createSession(SSHSite.java:118) at org.jvnet.hudson.plugins.SSHSite.executeCommand(SSHSite.java:128) at org.jvnet.hudson.plugins.SSHBuilder.perform(SSHBuilder.java:60) at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:19) at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:814) at hudson.model.Build$BuildExecution.build(Build.java:199) at hudson.model.Build$BuildExecution.doRun(Build.java:160) at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:593) at hudson.model.Run.execute(Run.java:1568) at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46) at hudson.model.ResourceController.execute(ResourceController.java:88) at hudson.model.Executor.run(Executor.java:237)

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