Jenkins - j_acegi_security_check

I am trying to setup jenkins, but I cant get the authentication to work. I am running jenkins on Tomcat6 on CentOS 6.2. I enable logging in, and everything goes fine until I try to log in. After giving my credential and pressing login, tomcat gives me a error:

"HTTP Status 404 - The requested resource () is not available." on http://myserver:8080/jenkins/j_acegi_security_check

By googling I can find this: https://issues.jenkins-ci.org/browse/JENKINS-3761

Two suggested fixes I have found:

• Run jenkins on tomcat instead of running the standalone version - I am already doing so.
• Edit a file: WEB-INF/security/SecurityFilters.groovy - I tried to edit, but I can't get it to change anything

Is there something I could do to make this work?

Spent ages wrestling with this one, make sure a Security Realm is set when you are choosing your Authorization method in Jenkins.

That is, in Manage Jenkins → Configure Global Security select an option in the Security Realm list.

For example:

You may have forgotten to select a Security Realm as specified below

https://wiki.jenkins-ci.org/display/JENKINS/Standard+Security+Setup

In case you have locked yourself out, you can revert the Jenkins config.xml file to set <useSecurity>true</useSecurity> node value to false by following instructions here

https://wiki.jenkins-ci.org/display/JENKINS/Disable+security

As mentioned on the bug page:

The error was caused by a proxy pass rule "/jenkins http://localhost:9080/jenkins/" which led to the incomming (jenkins) request "/jenkins//j_acegi_security_check" (double //). So the login page was rejected with 404 (while all other pages where served).

Make sure your /jenkins ProxyPass does not end with a trailing slash in the destination URL.