How to solve this error Jenkins - j acegi security check

Question

I am trying to run Jenkins, but I can’t get past the authentication page. I’m using tomact to run Jenkins and after entering my credential, tomcat gives me the following error:

HTTP Status 404 - The requested resource () is not available

Answer 1

This is a tricky one, make sure that a Security Realm is assigned when you choose your Authorization specification in Jenkins.

So first go to the Jenkins dashboard, then click on Manage Jenkins → Configure Global Security and select an option in the Security Realm according to your requirements.

Answer 2

This is how I resolved this issue:

# service tomcat status
tomcat start/running, process 996
# service tomcat stop
tomcat stop/waiting
# service jenkins status
Jenkins Continuous Integration Server is not running
# service jenkins restart
* Restarting Jenkins Continuous Integration Server jenkins                [ OK ]
# service tomcat start
tomcat start/running, process 3839
# service jenkins status
Jenkins Continuous Integration Server is running with the pid 3694

Refresh your browser and Jenkins should be up and running. Hope this helps!