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  1. Jenkins
  2. JENKINS-69740

Jenkins controller unable to connect to agents after ssh reconfiguration

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    • Icon: Story Story
    • Resolution: Not A Defect
    • Icon: Major Major
    • ssh-slaves-plugin
    • None

      Hello,

      I have added some lines to the /etc/ssh/sshd_config file to fix two low level vilnerabilities reported by Nessus as:

      • SSH Weak Key Exchange Algorithms Enabled
      • SSH Server CBC Mode Ciphers Enabled

      The lines I added were:

      KexAlgorithms curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-ni,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256

      Ciphers aes128-ctr,aes192-ctr,aes256-ctr

      MACs hmac-sha1,umac-64@openssh.com,hmac-ripemd160

      After restarting the SSH server, it was observed that Jenkins master was unable to communicate with the slave servers.

      Is there any specific reason and what are the recommended workarounds? Please advise.

      Regards,

      Indunil12

       

       

            ifernandezcalvo Ivan Fernandez Calvo
            indunil12 Indunil Welivitigoda
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              Created:
              Updated:
              Resolved: