java - Algorithm negotiation fail SSH in Jenkins -

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I am trying to do SSH on the local server from Jenkins, but the following error has been thrown: 

  [SSH] Exception: Algorithm negotiation fail com.jcraft.jsch.JSchException: algorithm talk com.jcraft.jsch.Session.receive_kexinit (Session.javaatar20) at com.jcraft.jsch.Session.connect (Sesson at com.jcraft.jsch.Session.connect (Session.java:150) at org.jvnet.hudson.plugins.SSHSite.createSession (SSHSite.java:141) on failed failed org.jvnet.hudson.plugins. java: 286) .SSHS on org.jvnet.hudson.plugins.SSHBuildWrapper.executePreBuildScript (SSHBuildWrapper.java:75) on Org.jvnet.hudson.plugins.SSHBuildWrapper.setUp (SSHBuildWrapper.java59) ite.executeCommand (SSHSite.java151) on hudson.model.Build $ BuildExecution.doRun hudson.model.AbstractBuild $ AbstractBuildExecution.run (AbstractBuild.java:533) to (Build.java:154) hudson.model.Run.execute ( Run.java:1754) in ended .model.FreeStyleBuild.run (FreeStyl hudson.model.ResourceController.execute (ResourceController.java:89) on hudson.model.Executor.run (Executor.java:240) on Hudson EBuild.java:43): Failure

Java version installed on SSH server: 

  Java version "1.8.0_25" Java (TM) SE runtime Environment (1.8.0_25-B184 Construction) Java HotSpot (TM) 64-bit server VM (25.25-B02, composite mode creation)

Installed version of Java on client: 

  Java version "1.8.0_25" Java (TM) SE runtime environment (Build 1.8.0_25-B18 ) Java Hotspot (TM) 64-bit server VM (Build 25.25-B02, mixed mode)

Also tried this solution: But it is not working. Everything is fine with putty. The connection is established, but when I trigger the Jenkins job, the error is thrown. Should I try the second version of the SSH server? Now I'm using copssh.

TL; Dr your sshd_config edit and Diffie-Hellman- group Vinimay- SHA1 and Diffie in KexAlgorithms-Hellman-Group1-SHA1: 

  KexAlgorithms curve25519-SHA256 @ libssh.org, ECDH-SHA2-nistp256 , ECDH-SHA2-nistp384, ECDH-SHA2 -nistp521, diffie-hellman-group-exchange-sha256, diffie-hellman-group14-sha1, diffie-hellman-group-exchange-sha1, diffie-hellman-group1-sha1

I suspect that the problem appeared in OpenSSH 6.7 after the following changes: "The default set of cipher and mac has been changed to remove the unsafe algorithm." (See ). This version was released on October 6, and was made for the Debian test (see) on October 21.

OpenSSH only enables the following major exchange algorithms by default:

  • curve25519-sha256@libssh.org
  • ECDH-SHA2-nistp256 <
  • ECDH-SHA2-nistp384
  • Support for JSP key currency (support " Under "see");
  • diffie-hellman-group14-sha1:

    • diffie-hellman-group-exchange-sha1
    • Diffie-hellman-group1-sha1

    In fact, they can not update Sshd_config agreeing on a common key exchange algorithm (and restarting the SSH server) I may apparently But since version 0.1.50 (see), JSAC is supposed to support the "Defy-Narcon-Group Exchange-SAS 256" method.


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