"Algorithm negotiation fail" error while creating tags on Jenkins using Bitbucket server
Platform Notice: Data Center Only - This article only applies to Atlassian products on the Data Center platform.
Note that this KB was created for the Data Center version of the product. Data Center KBs for non-Data-Center-specific features may also work for Server versions of the product, however they have not been tested. Support for Server* products ended on February 15th 2024. If you are running a Server product, you can visit the Atlassian Server end of support announcement to review your migration options.
*Except Fisheye and Crucible
Summary
While creating tags on the Bitbucket server, we see the "Algorithm negotiation fail" message in the Jenkins build logs.
Environment
Bitbucket server 8.x onwards
Jenkins
Diagnosis
The Jenkins Build Console logs have the below:
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03:22:56 Buildfile: /pso-jenkins/deployer/sd-client/git-tasks.xml
03:22:56
03:22:56 create-tag:
03:22:56 [create-tag] Taging EXEL/WM-2017/PHASE1/SDN/SDN1154 Started...
03:22:56 [create-tag] /apps/scope/pso-jenkins-ws/workspace/EXEL-WM2017-PHASE1-SDN/SCPP_base_Base
03:22:58
03:22:58 BUILD FAILED
03:22:58 /pso-jenkins/deployer/sd-client/git-tasks.xml:19: org.eclipse.jgit.api.errors.TransportException: ssh://git@atlgit-01.us.manh.com:7999/soscpp/base.git: Algorithm negotiation fail
03:22:58 at org.eclipse.jgit.api.PushCommand.call(PushCommand.java:160)
03:22:58 at com.manh.pso.ci.git.GitHelper.tagRepository(GitHelper.java:31)
03:22:58 at com.manh.pso.ci.tasks.CreateTag.execute(CreateTag.java:26)
03:22:58 at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:292)
03:22:58 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
03:22:58 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
03:22:58 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
03:22:58 at java.lang.reflect.Method.invoke(Method.java:498)
03:22:58 at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
03:22:58 at org.apache.tools.ant.Task.perform(Task.java:348)
03:22:58 at org.apache.tools.ant.Target.execute(Target.java:435)
03:22:58 at org.apache.tools.ant.Target.performTasks(Target.java:456)
03:22:58 at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1393)
03:22:58 at org.apache.tools.ant.Project.executeTarget(Project.java:1364)
03:22:58 at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
03:22:58 at org.apache.tools.ant.Project.executeTargets(Project.java:1248)
03:22:58 at org.apache.tools.ant.Main.runBuild(Main.java:851)
03:22:58 at org.apache.tools.ant.Main.startAnt(Main.java:235)
03:22:58 at org.apache.tools.ant.launch.Launcher.run(Launcher.java:280)
03:22:58 at org.apache.tools.ant.launch.Launcher.main(Launcher.java:109)
03:22:58 Caused by: org.eclipse.jgit.errors.TransportException: ssh://git@atlgit-01.us.manh.com:7999/soscpp/base.git: Algorithm negotiation fail
03:22:58 at org.eclipse.jgit.transport.JschConfigSessionFactory.getSession(JschConfigSessionFactory.java:142)
03:22:58 at org.eclipse.jgit.transport.SshTransport.getSession(SshTransport.java:121)
03:22:58 at org.eclipse.jgit.transport.TransportGitSsh$SshPushConnection.<init>(TransportGitSsh.java:306)
03:22:58 at org.eclipse.jgit.transport.TransportGitSsh.openPush(TransportGitSsh.java:152)
03:22:58 at org.eclipse.jgit.transport.PushProcess.execute(PushProcess.java:154)
03:22:58 at org.eclipse.jgit.transport.Transport.push(Transport.java:1173)
03:22:58 at org.eclipse.jgit.api.PushCommand.call(PushCommand.java:156)
03:22:58 ... 19 more
03:22:58 Caused by: com.jcraft.jsch.JSchException: Algorithm negotiation fail
03:22:58 at com.jcraft.jsch.Session.receive_kexinit(Session.java:582)
03:22:58 at com.jcraft.jsch.Session.connect(Session.java:320)
03:22:58 at org.eclipse.jgit.transport.JschConfigSessionFactory.getSession(JschConfigSessionFactory.java:116)Cause
The setting of plugin.ssh.dhgex.allow-sha1=true in bitbucket.properties would allow the sha1 keys on the Bitbucket side. The default was changed in Bitbucket 8.x to false.
Solution
Specify plugin.ssh.dhgex.allow-sha1=true in your <Bitbucket-home>/shared/bitbucket.properties file. You'll have to restart Bitbucket for this to take effect.
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