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Type: Bug
Resolution: Fixed
Priority: Major
Component/s: core, ssh-plugin, ssh-slaves-plugin, trilead-api-plugin
Labels:
Environment:
org.jenkins-ci.main:jenkins-war:2.170
org.jenkins-ci:crypto-util:1.1
org.jenkins-ci.modules:sshd:2.6
org.kohsuke:trilead-putty-extension:1.2
org.jenkins-ci.modules:ssh-cli-auth:1.5
org.jenkins-ci.plugins:ssh-slaves:1.29.4

Released As:
ssh-slaves-1.30.0

If you do not set the host field in the Node configuration it is possible to save it, then when it tries to connect fails with an NPE

Agent connection log

ERROR: Unexpected error in launching a agent. This is probably a bug in Jenkins.
java.lang.NullPointerException
at com.trilead.ssh2.KnownHosts.hostnameMatches(KnownHosts.java:313)
at com.trilead.ssh2.KnownHosts.getAllKnownHostEntries(KnownHosts.java:260)
at com.trilead.ssh2.KnownHosts.recommendHostkeyAlgorithms(KnownHosts.java:504)
at com.trilead.ssh2.KnownHosts.getPreferredServerHostkeyAlgorithmOrder(KnownHosts.java:282)
at hudson.plugins.sshslaves.verifiers.KnownHostsFileKeyVerificationStrategy.getPreferredKeyAlgorithms(KnownHostsFileKeyVerificationStrategy.java:92)
at hudson.plugins.sshslaves.SSHLauncher$2.call(SSHLauncher.java:837)
at hudson.plugins.sshslaves.SSHLauncher$2.call(SSHLauncher.java:833)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
 [04/04/19 15:40:41] Launch failed - cleaning up connection

Config.xml

<?xml version='1.1' encoding='UTF-8'?>
<slave>
   <name>agentNullHost</name>
   <description>agent description</description>
   <remoteFS>/home/jenkins</remoteFS>
   <numExecutors>1</numExecutors>
   <mode>NORMAL</mode>
   <retentionStrategy class="hudson.slaves.RetentionStrategy$Always"/>
    <launcher class="hudson.plugins.sshslaves.SSHLauncher" plugin="ssh-slaves@1.29.4">
       <port>22</port>
       <credentialsId>my-credentials</credentialsId>
       <launchTimeoutSeconds>210</launchTimeoutSeconds>
       <maxNumRetries>10</maxNumRetries>
       <retryWaitTime>15</retryWaitTime>
       <sshHostKeyVerificationStrategy class="hudson.plugins.sshslaves.verifiers.NonVerifyingKeyVerificationStrategy"/>
       <tcpNoDelay>true</tcpNoDelay>
  </launcher>
  <label>linux</label>
  <nodeProperties/>
</slave>