Hello,

We have started to see a major issue where Nodes (Slaves) are vanishing (disappearing) and reappearing on their own.

The strange thing is that the issue impacts and occurs only on nodes who run parallel pipelines.

During the multi pipeline parallel job execution, we see Nodes (Slaves) are vanishing (disappearing).

On the Jenkins side, when we try to access the node, we receive:

HTTP ERROR 404 Problem accessing /computer/Computer-2021. Reason: Not Found

One the client-side, the agent thinks it is still connected, but when we disconnect the agent and try to connect again we receive:

Failing to obtain http://jenkins:8080/computer/Computer-8021/slave-agent.jnlpFailing to obtain http://jenkins:8080/computer/Computer-8021/slave-agent.jnlp

java.io.IOException: Failed to load http://jenkins:8080/computer/Computer-8021/slave-agent.jnlp: 404 Not Foundjava.io.IOException: Failed to load http://jenkins:8080/computer/Computer-8021/slave-agent.jnlp: 404 Not Found

at hudson.remoting.Launcher.parseJnlpArguments(Launcher.java:496) at hudson.remoting.Launcher.parseJnlpArguments(Launcher.java:496)

at hudson.remoting.Launcher.run(Launcher.java:322) at hudson.remoting.Launcher.run(Launcher.java:322)

at hudson.remoting.Launcher.main(Launcher.java:283) at hudson.remoting.Launcher.main(Launcher.java:283)

Out observation:

1) After a certain time has passed & the parallel pipeline job ended, all of the missing nodes start to reappear again. about 1~24 hours.

2) Reload configuration from disk, bring all the vanished slaved back instantly.

More information:

Jenkins server version: 2.212.2 (Runs on Windows Server 2012R2)

All Slaves are JNLP agents running on Windows 7.

Please help us...