com.jcraft.jsch.JSchException

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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

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  • Cannot create connection to server with OpenSSH_6.7p1, OpenSSL 1.0.1j 15 Oct 2014. In configuration page it just say cannot connect to server. With openssh 6.6 all works fine. Trying to run something on that server: {code} [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: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$1.perform(BuildStepMonitor.java:20) at hudson.model.AbstractBuild$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$AbstractBuildExecution.run(AbstractBuild.java:533) at hudson.model.Run.execute(Run.java:1740) at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43) at hudson.model.ResourceController.execute(ResourceController.java:89) at hudson.model.Executor.run(Executor.java:240) Build step 'Execute shell script on remote host using ssh' marked build as failure {code} ngrep also says that "Algorithm negotiation" is the problem: {code} T 192.168.20.186:49916 -> 192.168.20.188:22 [AP] SSH-2.0-JSCH-0.1.42. T 192.168.20.188:22 -> 192.168.20.186:49916 [AP] SSH-2.0-OpenSSH_6.7.. T 192.168.20.186:49916 -> 192.168.20.188:22 [AP] ........^..gco..Z.$A.....=diffie-hellman-group1-sha1,diffie-hellman-group-exchange-sha1....ssh-rsa,ssh-dss...Jaes128-ctr,aes128 -cbc,3des-ctr,3des-cbc,blowfish-cbc,aes192-cbc,aes256-cbc...Jaes128-ctr,aes128-cbc,3des-ctr,3des-cbc,blowfish-cbc,aes192-cbc,ae s256-cbc...+hmac-md5,hmac-sha1,hmac-sha1-96,hmac-md5-96...+hmac-md5,hmac-sha1,hmac-sha1-96,hmac-md5-96....none....none......... ....H..(.4d.Qy...eV T 192.168.20.188:22 -> 192.168.20.186:49916 [AP] ......o[.o2...d...@..z....curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman- group-exchange-sha256,diffie-hellman-group14-sha1.../ssh-rsa,ssh-dss,ecdsa-sha2-nistp256,ssh-ed25519...laes128-ctr,aes192-ctr,a es256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com,chacha20-poly1305@openssh.com...laes128-ctr,aes192-ctr,aes256-ctr,aes12 8-gcm@openssh.com,aes256-gcm@openssh.com,chacha20-poly1305@openssh.com....umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac -sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac -sha2-256,hmac-sha2-512,hmac-sha1....umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-5 12-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1.... none,zlib@openssh.com....none,zlib@openssh.com................. T 192.168.20.186:49916 -> 192.168.20.188:22 [AP] ...T.........9com.jcraft.jsch.JSchException: Algorithm negotiation fail....enl....;R]7.. {code}
    via by Evgeny Persienko,
  • Cannot create connection to server with OpenSSH_6.7p1, OpenSSL 1.0.1j 15 Oct 2014. In configuration page it just say cannot connect to server. With openssh 6.6 all works fine. Trying to run something on that server: {code} [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: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$1.perform(BuildStepMonitor.java:20) at hudson.model.AbstractBuild$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$AbstractBuildExecution.run(AbstractBuild.java:533) at hudson.model.Run.execute(Run.java:1740) at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43) at hudson.model.ResourceController.execute(ResourceController.java:89) at hudson.model.Executor.run(Executor.java:240) Build step 'Execute shell script on remote host using ssh' marked build as failure {code} ngrep also says that "Algorithm negotiation" is the problem: {code} T 192.168.20.186:49916 -> 192.168.20.188:22 [AP] SSH-2.0-JSCH-0.1.42. T 192.168.20.188:22 -> 192.168.20.186:49916 [AP] SSH-2.0-OpenSSH_6.7.. T 192.168.20.186:49916 -> 192.168.20.188:22 [AP] ........^..gco..Z.$A.....=diffie-hellman-group1-sha1,diffie-hellman-group-exchange-sha1....ssh-rsa,ssh-dss...Jaes128-ctr,aes128 -cbc,3des-ctr,3des-cbc,blowfish-cbc,aes192-cbc,aes256-cbc...Jaes128-ctr,aes128-cbc,3des-ctr,3des-cbc,blowfish-cbc,aes192-cbc,ae s256-cbc...+hmac-md5,hmac-sha1,hmac-sha1-96,hmac-md5-96...+hmac-md5,hmac-sha1,hmac-sha1-96,hmac-md5-96....none....none......... ....H..(.4d.Qy...eV T 192.168.20.188:22 -> 192.168.20.186:49916 [AP] ......o[.o2...d...@..z....curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman- group-exchange-sha256,diffie-hellman-group14-sha1.../ssh-rsa,ssh-dss,ecdsa-sha2-nistp256,ssh-ed25519...laes128-ctr,aes192-ctr,a es256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com,chacha20-poly1305@openssh.com...laes128-ctr,aes192-ctr,aes256-ctr,aes12 8-gcm@openssh.com,aes256-gcm@openssh.com,chacha20-poly1305@openssh.com....umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac -sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac -sha2-256,hmac-sha2-512,hmac-sha1....umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-5 12-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1.... none,zlib@openssh.com....none,zlib@openssh.com................. T 192.168.20.186:49916 -> 192.168.20.188:22 [AP] ...T.........9com.jcraft.jsch.JSchException: Algorithm negotiation fail....enl....;R]7.. {code}
    via by Evgeny Persienko,
  • Algorithm negotiation fail in Jenkins
    via Stack Overflow by Ehsan Enayati
    ,
  • jenkinsでサーバ構築ツール作成 - Qiita
    via by Unknown author,
  • 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: 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: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$1.perform(BuildStepMonitor.java:20) at hudson.model.AbstractBuild$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:1740) at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43) at hudson.model.ResourceController.execute(ResourceController.java:89) at hudson.model.Executor.run(Executor.java:240)

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