Trying to configure a RHEL7 slave yields a java.io.IOException: Illegal char in base64 code error

[t3knoid]

I am trying to add a RHEL7 slave in my existing configuration that is using a Windows master. I am trying to use "Launch slave agents via SSH." I am getting the following error when I tried to configure the slave:

executing pre-launch scripts ...
java.io.IOException: Illegal char in base64 code.
at com.trilead.ssh2.crypto.Base64.decode(Base64.java:107)
at com.trilead.ssh2.KnownHosts.initialize(KnownHosts.java:406)
at com.trilead.ssh2.KnownHosts.initialize(KnownHosts.java:437)
at com.trilead.ssh2.KnownHosts.<init>(KnownHosts.java:86)
at hudson.plugins.sshslaves.verifiers.KnownHostsFileKeyVerificationStrategy.getPreferredKeyAlgorithms(KnownHostsFileKeyVerificationStrategy.java:91)
at hudson.plugins.sshslaves.SSHLauncher$2.call(SSHLauncher.java:796)
at hudson.plugins.sshslaves.SSHLauncher$2.call(SSHLauncher.java:792)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
[06/26/17 14:01:48] Launch failed - cleaning up connection
[06/26/17 14:01:48] [SSH] Connection closed.

I verified that I can SSH successfully from the master to the intended host using a private key. I also tried just a standard username/password with the same result.

[Michael Pailloncy]

Do you use the same Java version on the master and agent ? Which version of Jenkins are you using ?

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[t3knoid]

I am using Jenkins 2.66. Sorry I didn't provide earlier. I was hoping this something straightforward where I am not doing something right.

This is what I have in the Master (Windows)

java version "1.8.0_101"
Java(TM) SE Runtime Environment (build 1.8.0_101-b13)
Java HotSpot(TM) Client VM (build 25.101-b13, mixed mode, sharing)

This is what I have in RHEL:

Java(TM) SE Runtime Environment (build 1.8.0_131-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.131-b11, mixed mode)

On Monday, June 26, 2017 at 3:55:49 PM UTC-4, mpapo - Michael Pailloncy wrote:

Do you use the same Java version on the master and agent ? Which version of Jenkins are you using ?

2017-06-26 20:17 GMT+02:00 t3knoid <t3k...@gmail.com>:

I am trying to add a RHEL7 slave in my existing configuration that is using a Windows master. I am trying to use "Launch slave agents via SSH." I am getting the following error when I tried to configure the slave:

executing pre-launch scripts ...
java.io.IOException: Illegal char in base64 code.
at com.trilead.ssh2.crypto.Base64.decode(Base64.java:107)
at com.trilead.ssh2.KnownHosts.initialize(KnownHosts.java:406)
at com.trilead.ssh2.KnownHosts.initialize(KnownHosts.java:437)
at com.trilead.ssh2.KnownHosts.<init>(KnownHosts.java:86)
at hudson.plugins.sshslaves.verifiers.KnownHostsFileKeyVerificationStrategy.getPreferredKeyAlgorithms(KnownHostsFileKeyVerificationStrategy.java:91)
at hudson.plugins.sshslaves.SSHLauncher$2.call(SSHLauncher.java:796)
at hudson.plugins.sshslaves.SSHLauncher$2.call(SSHLauncher.java:792)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
[06/26/17 14:01:48] Launch failed - cleaning up connection
[06/26/17 14:01:48] [SSH] Connection closed.

I verified that I can SSH successfully from the master to the intended host using a private key. I also tried just a standard username/password with the same result.

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[Michael Pailloncy]

I've never set up a Jenkins master on Windows using Linux SSH Agents, but looking at the exception trace, something is wrong when reading your master known_hosts file.

Have you tried to disable 'Host Key Verification Strategy' on your SSH Agent settings ?

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