[JIRA] (JENKINS-58097) The agent is not able to connect to master after disabled JNLP2 protocol

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Alex Earl updated an issue   Jenkins / JENKINS-58097 The agent is not able to connect to master after disabled JNLP2 protocol Change By: Alex Earl After I disabled the deprecated "Inbound TCP Agent Protocol/2" on our server but only checked in "Inbound TCP Agent Protocol/4", it seems like the Windows slave agent service cannot connect with JNLP4. The log says:  Jun 15, 2019 4:30:37 PM hudson.remoting.jnlp.Main$CuiListener errorJun 15, 2019 4:30:37 PM hudson.remoting.jnlp.Main$CuiListener errorSEVERE: The server rejected the connection: Disabled protocol:Protocol:JNLP2-connectjava.lang.Exception: The server rejected the connection: Disabled protocol:Protocol:JNLP2-connect at hudson.remoting.Engine.onConnectionRejected(Engine.java:306) at hudson.remoting.Engine.run(Engine.java:276) Both of my master and slave agent machine runs  same Java version 1.8.0_77. My jenkins version is 2.176.1. I read a post online (URL: https://issues.jenkins-ci.org/browse/JENKINS-53018?page=com.atlassian.jira.plugin.system.issuetabpanels%3Aall-tabpanel),  someone said "I managed to figure out why our machine couldn't connect with JNLP4. By default the slave.jar file on Windows is not updated automatically. After manually downloading the file and putting it in the right place our WIndows slave happily connects using JNLP4."  I can download the slave.jar, but I don't know how to deal with this slave.jar file, i.e., where i should place into, how to run to update the old slave.jar, and where is the location of old slave.jar. I am new to Jenkins, hope someone can help me out. Much appreciate!  Also, it would be great if that could be fixed so that everyone can disable JNLP2.   Add Comment   This message was sent by Atlassian Jira (v7.13.12#713012-sha1:6e07c38) -- You received this message because you are subscribed to the Google Groups "Jenkins Issues" group. To unsubscribe from this group and stop receiving emails from it, send an email to jenkinsci-issues+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/jenkinsci-issues/JIRA.200139.1560954313000.7232.1584240660200%40Atlassian.JIRA.