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Algorithm negotiation fail with version 4.11 [message #1784038]

Wed, 21 March 2018 19:51

Dmitriy Mestetskiy

Messages: 3
Registered: March 2018

Junior Member

tried everything I can with Egit 4.11 on Eclipse Oxygen to get it working but had no luck. Downgraded to version 4.6 and everything worked.

Checked my JCE and SSH2 and java settings end everything seems fine. anyone have any ideas on why 4.11 doesn't work?

!SUBENTRY 1 org.eclipse.egit.ui 4 0 2018-03-21 13:17:28.395
!MESSAGE ssh://git@host:7999/repo.git: Algorithm negotiation fail
!STACK 0
org.eclipse.jgit.api.errors.TransportException: ssh://git@host:7999/repo.git: Algorithm negotiation fail
        at org.eclipse.jgit.api.FetchCommand.call(FetchCommand.java:252)
        at org.eclipse.egit.core.op.FetchOperation.run(FetchOperation.java:132)
        at org.eclipse.egit.ui.internal.fetch.FetchOperationUI.execute(FetchOperationUI.java:108)
        at org.eclipse.egit.ui.internal.fetch.FetchOperationUI$1.performJob(FetchOperationUI.java:134)
        at org.eclipse.egit.ui.internal.jobs.RepositoryJob.run(RepositoryJob.java:57)
        at org.eclipse.core.internal.jobs.Worker.run(Worker.java:56)
Caused by: org.eclipse.jgit.errors.TransportException: ssh://git@host:7999/repo.git: Algorithm negotiation fail
        at org.eclipse.jgit.transport.JschConfigSessionFactory.getSession(JschConfigSessionFactory.java:182)
        at org.eclipse.jgit.transport.SshTransport.getSession(SshTransport.java:140)
        at org.eclipse.jgit.transport.TransportGitSsh$SshFetchConnection.<init>(TransportGitSsh.java:280)
        at org.eclipse.jgit.transport.TransportGitSsh.openFetch(TransportGitSsh.java:170)
        at org.eclipse.jgit.transport.FetchProcess.executeImp(FetchProcess.java:137)
        at org.eclipse.jgit.transport.FetchProcess.execute(FetchProcess.java:123)
        at org.eclipse.jgit.transport.Transport.fetch(Transport.java:1269)
        at org.eclipse.jgit.api.FetchCommand.call(FetchCommand.java:241)
        ... 5 more
Caused by: com.jcraft.jsch.JSchException: Algorithm negotiation fail
        at com.jcraft.jsch.Session.receive_kexinit(Session.java:590)
        at com.jcraft.jsch.Session.connect(Session.java:320)
        at org.eclipse.jgit.transport.JschConfigSessionFactory.getSession(JschConfigSessionFactory.java:136)
        ... 12 more

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Re: Algorithm negotiation fail with version 4.11 [message #1784644 is a reply to message #1784038]

Sat, 31 March 2018 22:36

Matthias Sohn

Messages: 1204
Registered: July 2009

Senior Member

4.11 respects ~/.ssh/config whereas 4.6 does not.
Hence have a look at your ssh configuration

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Re: Algorithm negotiation fail with version 4.11 [message #1784691 is a reply to message #1784644]

Mon, 02 April 2018 15:49

Dmitriy Mestetskiy

Messages: 3
Registered: March 2018

Junior Member

How can command-line command work but this does not? When I run

git clone ssh://git@host:port/project/branch.git

I see it using config and working fine.

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Re: Algorithm negotiation fail with version 4.11 [message #1786753 is a reply to message #1784691]

Thu, 10 May 2018 15:26

Matthias Sohn

Messages: 1204
Registered: July 2009

Senior Member

By default JGit and EGit use the Java jsch implementation of SSH which is different from openssh used by native git command line.
You can try to use an external SSH implementation by setting the environment variable GIT_SSH to the path of the external
ssh client executable e.g.

$ GIT_SSH=/usr/bin/ssh jgit clone ssh://msohn@git.eclipse.org:29418/jgit/jgit
Cloning into 'jgit'...
remote: Counting objects: 1
remote: Finding sources: 100% (86/86)
Receiving objects: 100% (93745/93745)
Resolving deltas: 100% (41092/41092)

I use the following script "jgit" to start jgit command line from the maven build result:

#!/bin/sh
java -Xmx1G -jar ~/src/git/jgit/org.eclipse.jgit.pgm/target/jgit-cli.jar $*

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Re: Algorithm negotiation fail with version 4.11 [message #1786886 is a reply to message #1784691]

Mon, 14 May 2018 22:21

Thomas Wolf

Messages: 477
Registered: August 2016

Senior Member

Dmitriy Mestetskiy wrote on Mon, 02 April 2018 15:49

How can command-line command work but this does not?

Eclipse by default uses a Java implementation of an ssh client called jsch. Command line git uses command-line ssh. Evidently one can work where the other may not.

Now,

Caused by: com.jcraft.jsch.JSchException: Algorithm negotiation fail
        at com.jcraft.jsch.Session.receive_kexinit(Session.java:590)

means the client and server could not agree on a cipher for the key exchange. What ciphers does your server offer?

Depending on what your server offers, you may need to enable JCE (Java Cryptography Extensions) to get jsch to use stronger ciphers. See this stack overflow question and its accepted answer for hints.

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Re: Algorithm negotiation fail with version 4.11 [message #1839691 is a reply to message #1786886]

Thu, 25 March 2021 19:15

Dmitriy Mestetskiy

Messages: 3
Registered: March 2018

Junior Member

looks like with the latest eclipse and EGit 5.2.0.201812061821-r the issue has been resolved. Just need to change in git preferences SSH client to "Apache MINA sshd"

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