Issue
When you try to access the instance, you get a Bad Message 413 (Request Entity Too Large) error. This is a known Jenkins issue JENKINS-25046, specifically when using Jetty as the web server. As each time that Jenkins restarts its session cookie changes. The problem is that after some time, your browser can have a bunch of session cookies each one with a different name. This causes the cookie request header to be very long, this will cause the server to return a 413 response and a blank page.
Environment
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CloudBees CI (CloudBees Core) on modern cloud platforms - Managed controller
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CloudBees CI (CloudBees Core) on modern cloud platforms - Operations Center
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CloudBees CI (CloudBees Core) on traditional platforms - Client controller
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CloudBees CI (CloudBees Core) on traditional platforms - Operations Center
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CloudBees Jenkins Enterprise
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CloudBees Jenkins Enterprise - Managed controller
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CloudBees Jenkins Enterprise - Operations center
Resolution
In Jenkins versions higher than 2.66, you will have a Jetty version included that will allow you to customize the above described behavior via the following System properties:
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executableWar.jetty.disableCustomSessionIdCookieNamethe default value for this property is false. You could set this to true to prevent the problem described above. -
executableWar.jetty.sessionIdCookieNamewhich defaults to null. But sets a custom session ID cookie name when the previous parameter is set to false.