The first error that I put here is with SSH Slave version 1.11 

Expanded the channel window size to 4MB
[04/02/19 09:05:15] [SSH] Starting slave process: cd "/var/jenkins" && 
/usr/lib/jvm/jdk1.8.0_191/bin/java -Xmx128m -Xms128m -jar slave.jar

<===[JENKINS REMOTING CAPACITY]===>channel started
Remoting version: 3.29
This is a Unix agent
Evacuated stdout
Starting Selenium nodes on automation-jenkins-node

Apr 02, 2019 9:05:17 AM org.jenkinsci.remoting.util.AnonymousClassWarnings warn
WARNING: Attempt to (de-)serialize anonymous class 
hudson.plugins.selenium.configuration.DirectJsonInputConfiguration$1; see: 
https://jenkins.io/redirect/serialization-of-anonymous-classes/

hudson.util.IOException2: Slave JVM has not reported exit code. Is it still 
running?
        at hudson.plugins.sshslaves.SSHLauncher.startSlave(SSHLauncher.java:984)
        at hudson.plugins.sshslaves.SSHLauncher.access$400(SSHLauncher.java:137)
        at hudson.plugins.sshslaves.SSHLauncher$2.call(SSHLauncher.java:725)
        at hudson.plugins.sshslaves.SSHLauncher$2.call(SSHLauncher.java:706)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
Caused by: java.io.IOException: Failed to copy 
/var/lib/jenkins/plugins/selenium/WEB-INF/lib/selenium-server-standalone-3.12.0.jar
 to /var/jenkins/selenium-server-standalone-3.12.0.jar
        at hudson.FilePath.copyTo(FilePath.java:2191)


And the last error, is with SSH Slave 1.29.4

Apr 03, 2019 9:46:01 AM org.jenkinsci.remoting.util.AnonymousClassWarnings warn

WARNING: Attempt to (de-)serialize anonymous class 
hudson.plugins.selenium.configuration.DirectJsonInputConfiguration$1; see: 
https://jenkins.io/redirect/serialization-of-anonymous-classes/
Apr 03, 2019 9:46:06 AM 
hudson.remoting.SynchronousCommandTransport$ReaderThread run
INFO: I/O error in channel channel

java.io.IOException: Unexpected termination of the channel
        at 
hudson.remoting.SynchronousCommandTransport$ReaderThread.run(SynchronousCommandTransport.java:77)
Caused by: java.io.EOFException
        at 
java.io.ObjectInputStream$PeekInputStream.readFully(ObjectInputStream.java:2681)
        at 
java.io.ObjectInputStream$BlockDataInputStream.readShort(ObjectInputStream.java:3156)
        at 
java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:862)
        at java.io.ObjectInputStream.<init>(ObjectInputStream.java:358)
        at 
hudson.remoting.ObjectInputStreamEx.<init>(ObjectInputStreamEx.java:49)
        at hudson.remoting.Command.readFrom(Command.java:140)
        at hudson.remoting.Command.readFrom(Command.java:126)
        at 
hudson.remoting.AbstractSynchronousByteArrayCommandTransport.read(AbstractSynchronousByteArrayCommandTransport.java:36)
        at 
hudson.remoting.SynchronousCommandTransport$ReaderThread.run(SynchronousCommandTransport.java:63)

After I updated the ssh-slave plugin to 1.29.4, I have checked in 
JENKINS_HOME/plugins folder.

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