Unable to Connect to Jenkins Server (Amazon Linux AMI)

When I had installed Jenkins on Amazon Linux AMI following steps mentioned in http://bhargavamin.com/how-to-do/install-jenkins-on-amazon-linux-aws/

After installation I was able to open Jenkins through browser but when I selected option "Install Plugins" it showed error as "Unable to connect to Jenkins Server."

So then how to troubleshoot this issue??

Answers 1

  • The problem here is pretty simple, if you do curl http://127.0.0.1:8080 on your host machine, you should get a message stating:

    Authentication required
    <!--
    You are authenticated as: anonymous
    Groups that you are in:
    
    Permission you need to have (but didn't): hudson.model.Hudson.Administer
    -->
    

    This means that jenkins has anonymous priviledges which is not allowing any connection.

    To solve this issue, you will have to do two changes:

    1. Add Jenkins user to root group: sudo usermod -a -G root jenkins

    2. Make Jenkins listen to all external IPs by editing file /etc/sysconfig/jenkins and changing the JENKINS_LISTEN_ADDRESS="0.0.0.0"

    Once this is done, restart the jenkins server and then try to install plugins for jenkins.


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