Not Mandatory, but easier. You might need to create a jks file. Like I have 
done for JIRA or Teamcity (any java base web)
https://serverfault.com/questions/278555/how-to-use-jenkins-with-ssl-https


From: [email protected] 
[mailto:[email protected]] On Behalf Of Kaliyug Antagonist
Sent: 27 November 2017 10:38
To: Jenkins Users
Subject: EXTERNAL: Re: EXTERNAL: Jenkins start-up fails after pointing to ssl 
cert and key

I can try that but is it mandatory to go that way? Can't Jenkins SSL work with 
the settings that I am using?

On Monday, November 27, 2017 at 11:28:09 AM UTC+1, Joaquin Henriquez wrote:
Whats if you use NGINX as a reverse proxy …. That’s what I am doing (SSL) and 
it is working fine.

From: [email protected]<javascript:> 
[mailto:[email protected]<javascript:>] On Behalf Of Kaliyug 
Antagonist
Sent: 27 November 2017 09:50
To: Jenkins Users
Subject: EXTERNAL: Jenkins start-up fails after pointing to ssl cert and key


  *   Jenkins 2.73.3
  *   Java(TM) SE Runtime Environment (build 1.8.0_151-b12) Java HotSpot(TM) 
64-Bit Server VM (build 25.151-b12, mixed mode)
  *   Red Hat Enterprise Linux Server release 7.4 (Maipo)

The SSL cert and keys:

[root@l5109p ssl]# ls -lrt /etc/security/ssl/

-rw-r-----. 1 jenkins jenkins  2894 Nov 27 09:17 
jenkins_wildcard.sss.se.com.cert.pem

-rw-r-----. 1 jenkins jenkins  1766 Nov 27 09:18 
jenkins_wildcard.sss.se.com.key.pem

In the /etc/sysconfig/jenkins, I have added the following entry:

JENKINS_ARGS="--httpsPort=8443 
--httpsCertificate=/etc/security/ssl/jenkins_wildcard.sss.se.com.cert.pem 
--httpsPrivateKey=/etc/security/ssl/jenkins_wildcard.sss.se.com.key.pem"

On starting the jenkins service, it fails with the following error:

Running from: /usr/lib/jenkins/jenkins.war

Nov 27, 2017 9:42:17 AM Main deleteWinstoneTempContents

WARNING: Failed to delete the temporary Winstone file /tmp/winstone/jenkins.war

Nov 27, 2017 9:42:17 AM org.eclipse.jetty.util.log.Log initialized

INFO: Logging initialized @393ms to org.eclipse.jetty.util.log.JavaUtilLog

Nov 27, 2017 9:42:17 AM winstone.Logger logInternal

INFO: Beginning extraction from war file

Nov 27, 2017 9:42:17 AM org.eclipse.jetty.server.handler.ContextHandler 
setContextPath

WARNING: Empty contextPath

Nov 27, 2017 9:42:17 AM winstone.Logger logInternal

INFO: Winstone shutdown successfully

java.io.IOException: Failed to start a listener: winstone.HttpsConnectorFactory

        at winstone.Launcher.spawnListener(Launcher.java:209)

        at winstone.Launcher.<init>(Launcher.java:150)

        at winstone.Launcher.main(Launcher.java:354)

        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

        at java.lang.reflect.Method.invoke(Method.java:498)

        at Main._main(Main.java:294)

        at Main.main(Main.java:132)

Caused by: java.lang.IllegalArgumentException: Not B64 encoded

        at org.eclipse.jetty.util.B64Code.decode(B64Code.java:428)

        at org.eclipse.jetty.util.B64Code.decode(B64Code.java:391)

        at 
winstone.AbstractSecuredConnectorFactory.readPEMRSAPrivateKey(AbstractSecuredConnectorFactory.java:131)

        at 
winstone.AbstractSecuredConnectorFactory.configureSsl(AbstractSecuredConnectorFactory.java:75)

        at winstone.HttpsConnectorFactory.start(HttpsConnectorFactory.java:41)

        at winstone.Launcher.spawnListener(Launcher.java:207)

        ... 8 more

Nov 27, 2017 9:42:17 AM winstone.Logger logInternal

SEVERE: Container startup failed

java.io.IOException: Failed to start a listener: winstone.HttpsConnectorFactory

        at winstone.Launcher.spawnListener(Launcher.java:209)

        at winstone.Launcher.<init>(Launcher.java:150)

        at winstone.Launcher.main(Launcher.java:354)

        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

        at java.lang.reflect.Method.invoke(Method.java:498)

        at Main._main(Main.java:294)

        at Main.main(Main.java:132)

Caused by: java.lang.IllegalArgumentException: Not B64 encoded

        at org.eclipse.jetty.util.B64Code.decode(B64Code.java:428)

        at org.eclipse.jetty.util.B64Code.decode(B64Code.java:391)

        at 
winstone.AbstractSecuredConnectorFactory.readPEMRSAPrivateKey(AbstractSecuredConnectorFactory.java:131)

        at 
winstone.AbstractSecuredConnectorFactory.configureSsl(AbstractSecuredConnectorFactory.java:75)

        at winstone.HttpsConnectorFactory.start(HttpsConnectorFactory.java:41)

        at winstone.Launcher.spawnListener(Launcher.java:207)

        ... 8 more
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