[JENKINS-48761] Jenkins Agents do not connect after update from version 2.95 to version 2.99 and jobs fail

[jenkins-infra-bot]

Seeing something that sounds similar to https://issues.jenkins-ci.org/browse/JENKINS-48754.

"After having installed Jenkins Version 2.99, none of my agents did connect to the server anymore. Even a restart of the java script on the slave did not help."

Workaround: Update Remoting on the agent side to 3.15

Agent is launched like so:

java -jar agent.jar -jnlpUrl https:///computer//<>.jnlp -secret 

---

Originally reported by panajev, imported from: Jenkins Agents do not connect after update from version 2.95 to version 2.99 and jobs fail

• assignee: oleg_nenashev
• status: Closed
• priority: Blocker
• component(s): remoting
• label(s): regression
• resolution: Fixed
• resolved: 2018-01-03T22:51:28+00:00
• votes: 3
• watchers: 8
• imported: 2025-11-25

Raw content of original issue

Seeing something that sounds similar to https://issues.jenkins-ci.org/browse/JENKINS-48754.

"After having installed Jenkins Version 2.99, none of my agents did connect to the server anymore. Even a restart of the java script on the slave did not help."

Workaround: Update Remoting on the agent side to 3.15 

Agent is launched like so:

java -jar agent.jar -jnlpUrl https://<Jenkins URL>/computer/<AgentName>/<>.jnlp -secret <Agent Secret>

• environment: CentOS root node and 2 macOS agents connecting to it through JNLP4.

[jenkins-infra-bot]

• Remote links associated with this issue:

  • [JENKINS-48761] - Restore binary compatibility with agents running old Remoting versions jenkins#3212
  • Retrospective thread

[jenkins-infra-bot]

panajev:

• Original comment link
• Raw content of original comment:

  May be related... Suggested workaround is to update remoting to 3.15 for the agents. oleg_nenashev how would I do that?
  
  Remoting on the master should have happened with the 2.98 Jenkins update:
  
  
   Update Remoting from 3.14 to 3.15 to fix several issues. (full changelog, issue 37566, issue 37670, issue 38696, issue 46724, issue 47965, issue 48055, issue 48130, issue 48133, issue 48309) 
  
  
  

May be related... Suggested workaround is to update remoting to 3.15 for the agents. oleg_nenashev how would I do that?

Remoting on the master should have happened with the 2.98 Jenkins update:

 Update Remoting from 3.14 to 3.15 to fix several issues. (full changelog, issue 37566, issue 37670, issue 38696, issue 46724, issue 47965, issue 48055, issue 48130, issue 48133, issue 48309) 

[jenkins-infra-bot]

oleg_nenashev:

• Original comment link
• Raw content of original comment:

  > Suggested workaround is to update remoting to 3.15 for the agents. Oleg Nenashev how would I do that?
  
  Depends on which Launcher you use...
  
  
  	
  SSH Slaves get updated automatically
  	
  Windows Slaves (Java Web Start ones) may need manual update of slave.jar OR service restart if automatic upgrade is enabled
  	
  Swarm Plugin - update to the latest Swarm Plugin Client
  	
  Other agent types - to be handled on a case-by-case basis
  
  
  

> Suggested workaround is to update remoting to 3.15 for the agents. Oleg Nenashev how would I do that?

Depends on which Launcher you use...

• SSH Slaves get updated automatically
• Windows Slaves (Java Web Start ones) may need manual update of slave.jar OR service restart if automatic upgrade is enabled
• Swarm Plugin - update to the latest Swarm Plugin Client
• Other agent types - to be handled on a case-by-case basis

[jenkins-infra-bot]

panajev:

• Original comment link
• Raw content of original comment:

  Stupid me...
  
  wget https://<Jenkins CI>/jnlpJars/agent.jar
  
  
  ... results in a connected Agent .
  

Stupid me...

wget https:///jnlpJars/agent.jar

... results in a connected Agent .

[jenkins-infra-bot]

oleg_nenashev:

• Original comment link
• Raw content of original comment:

  Well, it SHOULD be working with old agent versions
  

Well, it SHOULD be working with old agent versions

[jenkins-infra-bot]

panajev:

• Original comment link
• Raw content of original comment:

  Fair enough, thanks for working on it .
  

Fair enough, thanks for working on it .

[jenkins-infra-bot]

scm_issue_link:

• Original comment link
• Raw content of original comment:

  Code changed in jenkins
  User: Oleg Nenashev
  Path:
   core/src/main/java/hudson/Launcher.java
   core/src/main/java/hudson/model/Computer.java
   core/src/main/java/hudson/slaves/ChannelPinger.java
   core/src/main/java/hudson/slaves/SlaveComputer.java
   core/src/main/java/jenkins/security/MasterToSlaveCallable.java
   core/src/main/java/jenkins/slaves/StandardOutputSwapper.java
  http://jenkins-ci.org/commit/jenkins/4eb314b32742a07dcc68e716b7de1d31f0f917c8
  Log:
    JENKINS-48761 - Restore binary compatibility with agents running old Remoting versions
  
  
  

Code changed in jenkins
User: Oleg Nenashev
Path:
core/src/main/java/hudson/Launcher.java
core/src/main/java/hudson/model/Computer.java
core/src/main/java/hudson/slaves/ChannelPinger.java
core/src/main/java/hudson/slaves/SlaveComputer.java
core/src/main/java/jenkins/security/MasterToSlaveCallable.java
core/src/main/java/jenkins/slaves/StandardOutputSwapper.java
http://jenkins-ci.org/commit/jenkins/4eb314b32742a07dcc68e716b7de1d31f0f917c8
Log:
JENKINS-48761 - Restore binary compatibility with agents running old Remoting versions

[jenkins-infra-bot]

scm_issue_link:

• Original comment link
• Raw content of original comment:

  Code changed in jenkins
  User: Oleg Nenashev
  Path:
   core/src/main/java/jenkins/security/MasterToSlaveCallable.java
  http://jenkins-ci.org/commit/jenkins/cf1589734f98d895ecfab0ffda18976527f8d507
  Log:
    JENKINS-48761 - Use pre-Remoting 3.0 ChannelClosedException APIs
  
  
  

Code changed in jenkins
User: Oleg Nenashev
Path:
core/src/main/java/jenkins/security/MasterToSlaveCallable.java
http://jenkins-ci.org/commit/jenkins/cf1589734f98d895ecfab0ffda18976527f8d507
Log:
JENKINS-48761 - Use pre-Remoting 3.0 ChannelClosedException APIs

[jenkins-infra-bot]

scm_issue_link:

• Original comment link
• Raw content of original comment:

  Code changed in jenkins
  User: Oleg Nenashev
  Path:
   test/pom.xml
   test/src/test/java/jenkins/slaves/OldRemotingAgentTest.java
  http://jenkins-ci.org/commit/jenkins/8a34983d4571bab3acce87bb84ecd05a8251e528
  Log:
    JENKINS-48761 - Create a smoke test for old agents
  
  
  

Code changed in jenkins
User: Oleg Nenashev
Path:
test/pom.xml
test/src/test/java/jenkins/slaves/OldRemotingAgentTest.java
http://jenkins-ci.org/commit/jenkins/8a34983d4571bab3acce87bb84ecd05a8251e528
Log:
JENKINS-48761 - Create a smoke test for old agents

[jenkins-infra-bot]

scm_issue_link:

• Original comment link
• Raw content of original comment:

  Code changed in jenkins
  User: Oleg Nenashev
  Path:
   core/src/filter/resources/jenkins/slaves/remoting-info.properties
   core/src/main/java/hudson/Launcher.java
   core/src/main/java/hudson/TcpSlaveAgentListener.java
   core/src/main/java/hudson/model/Computer.java
   core/src/main/java/hudson/slaves/ChannelPinger.java
   core/src/main/java/hudson/slaves/SlaveComputer.java
   core/src/main/java/jenkins/security/MasterToSlaveCallable.java
   core/src/main/java/jenkins/slaves/RemotingVersionInfo.java
   core/src/main/java/jenkins/slaves/StandardOutputSwapper.java
   core/src/test/java/jenkins/slaves/RemotingVersionInfoTest.java
   pom.xml
   test/pom.xml
   test/src/test/java/jenkins/slaves/OldRemotingAgentTest.java
  http://jenkins-ci.org/commit/jenkins/01b8ed8c71dee97d661bd5bf4b8e4bc5ecd636ae
  Log:
    JENKINS-48761 - Address review comments from @jglick
  
  
  

Code changed in jenkins
User: Oleg Nenashev
Path:
core/src/filter/resources/jenkins/slaves/remoting-info.properties
core/src/main/java/hudson/Launcher.java
core/src/main/java/hudson/TcpSlaveAgentListener.java
core/src/main/java/hudson/model/Computer.java
core/src/main/java/hudson/slaves/ChannelPinger.java
core/src/main/java/hudson/slaves/SlaveComputer.java
core/src/main/java/jenkins/security/MasterToSlaveCallable.java
core/src/main/java/jenkins/slaves/RemotingVersionInfo.java
core/src/main/java/jenkins/slaves/StandardOutputSwapper.java
core/src/test/java/jenkins/slaves/RemotingVersionInfoTest.java
pom.xml
test/pom.xml
test/src/test/java/jenkins/slaves/OldRemotingAgentTest.java
http://jenkins-ci.org/commit/jenkins/01b8ed8c71dee97d661bd5bf4b8e4bc5ecd636ae
Log:
JENKINS-48761 - Address review comments from @​jglick

[jenkins-infra-bot]

scm_issue_link:

• Original comment link
• Raw content of original comment:

  Code changed in jenkins
  User: Oleg Nenashev
  Path:
   core/src/filter/resources/jenkins/slaves/remoting-info.properties
   core/src/main/java/hudson/Launcher.java
   core/src/main/java/hudson/TcpSlaveAgentListener.java
   core/src/main/java/hudson/model/Computer.java
   core/src/main/java/hudson/slaves/SlaveComputer.java
   core/src/main/java/jenkins/security/MasterToSlaveCallable.java
   core/src/main/java/jenkins/slaves/RemotingVersionInfo.java
   core/src/test/java/jenkins/slaves/RemotingVersionInfoTest.java
   pom.xml
   test/pom.xml
   test/src/test/java/jenkins/slaves/OldRemotingAgentTest.java
  http://jenkins-ci.org/commit/jenkins/8eb4254b0f56086f6576c108913fc5d066f4be9b
  Log:
    Merge pull request #3212 from oleg-nenashev/bug/JENKINS-48761-remoting-API
  
  JENKINS-48761 - Restore binary compatibility with agents running old Remoting versions
  
  
  Compare: jenkinsci/jenkins@99ca101...8eb4254
  
  

Code changed in jenkins
User: Oleg Nenashev
Path:
core/src/filter/resources/jenkins/slaves/remoting-info.properties
core/src/main/java/hudson/Launcher.java
core/src/main/java/hudson/TcpSlaveAgentListener.java
core/src/main/java/hudson/model/Computer.java
core/src/main/java/hudson/slaves/SlaveComputer.java
core/src/main/java/jenkins/security/MasterToSlaveCallable.java
core/src/main/java/jenkins/slaves/RemotingVersionInfo.java
core/src/test/java/jenkins/slaves/RemotingVersionInfoTest.java
pom.xml
test/pom.xml
test/src/test/java/jenkins/slaves/OldRemotingAgentTest.java
http://jenkins-ci.org/commit/jenkins/8eb4254b0f56086f6576c108913fc5d066f4be9b
Log:
Merge pull request #3212 from oleg-nenashev/bug/JENKINS-48761-remoting-API

JENKINS-48761 - Restore binary compatibility with agents running old Remoting versions

Compare: jenkinsci/jenkins@99ca101...8eb4254

[jenkins-infra-bot]

oleg_nenashev:

• Original comment link
• Raw content of original comment:

  It should be resolved in Jenkins 2.100, the release is currently in the progress. 
  Retrospective thread: https://groups.google.com/forum/#!topic/jenkinsci-dev/-VQ5YU0yYhg
  

It should be resolved in Jenkins 2.100, the release is currently in the progress.
Retrospective thread: https://groups.google.com/forum/#!topic/jenkinsci-dev/-VQ5YU0yYhg

[jenkins-infra-bot]

scm_issue_link:

• Original comment link
• Raw content of original comment:

  Code changed in jenkins
  User: Oleg Nenashev
  Path:
   content/_data/changelogs/weekly.yml
  http://jenkins-ci.org/commit/jenkins.io/ac42d83bf51e56e826991839a5471eccdd767543
  Log:
    Changelog: noting JENKINS-48761/JENKINS-48754 in Jenkins 2.100.
  
  The PR also adds warning banners to 2.98/2.99
  
  
  

Code changed in jenkins
User: Oleg Nenashev
Path:
content/_data/changelogs/weekly.yml
http://jenkins-ci.org/commit/jenkins.io/ac42d83bf51e56e826991839a5471eccdd767543
Log:
Changelog: noting JENKINS-48761/JENKINS-48754 in Jenkins 2.100.

The PR also adds warning banners to 2.98/2.99

[jenkins-infra-bot]

scm_issue_link:

• Original comment link
• Raw content of original comment:

  Code changed in jenkins
  User: R. Tyler Croy
  Path:
   content/_data/changelogs/weekly.yml
  http://jenkins-ci.org/commit/jenkins.io/99fe6d097fd1cc1f6797ad7b816c98dec3261a37
  Log:
    Merge pull request #1305 from oleg-nenashev/changelog/2.100
  
  Changelog: noting JENKINS-48761/JENKINS-48754 in Jenkins 2.100.
  
  
  Compare: jenkins-infra/jenkins.io@6236276...99fe6d0
  
  

Code changed in jenkins
User: R. Tyler Croy
Path:
content/_data/changelogs/weekly.yml
http://jenkins-ci.org/commit/jenkins.io/99fe6d097fd1cc1f6797ad7b816c98dec3261a37
Log:
Merge pull request #1305 from oleg-nenashev/changelog/2.100

Changelog: noting JENKINS-48761/JENKINS-48754 in Jenkins 2.100.

Compare: jenkins-infra/jenkins.io@6236276...99fe6d0