Diagnosing Pages which Won't Render Correctly

Issue

Your web browser displays a blank page when navigating in Jenkins

Environment

CloudBees Jenkins Enterprise

Resolution

There’s no straightforward resolution for this kind of problems. First step is to try to use a more recent web browser. If it doesn’t help, you should open a support ticket.

In order to help CloudBees to understand what’s happening on your Jenkins instance, you should collect some data. Please use either Chrome or Firefox to run this procedure, these browsers include the required tools to help us.

  1. Take a screen shot of the web browser window, including its URL field by pressing Alt-Print screen
  2. Record the HTTP session and Javascript console content of your Web browser

If your use Chrome:

  1. Open the Developer Tools by pressing F12
  2. Click on the Network tab
  3. Ensure recording is enabled (round button at the top left of the Network tab should be red)
  4. Activate Preserve log checkbox
  5. Click the Clean button (second button at the top left of the Network tab)
  6. Access the failing Jenkins page or reload it by pressing F5
  7. Save the capture by right-clicking on the grid and choosing “Save as HAR with Content
  8. Click on the Console tab
  9. Take a screen shot of the browser window by pressing Alt-Print screen

If you use Firefox:

  1. Ensure you have Firebug and NetExport extension installed (restart Firefox if you just installed them)
  2. Open Firebug by pressing F12
  3. Click on the Console tab and enable Console
  4. Click on the Net tab and enable Net capture
  5. Click the Clear and Persist button
  6. Access the failing Jenkins page
  7. Save the capture by clicking Export button and “Save as…
  8. Click on the Console tab
  9. Take a screen shot of the browser window by pressing Alt-Print screen

Attach all collected data to the support ticket.

Appendix: HAR file analysis

HAR file stands for HTTP ARchive and is produced by HTTP tracking tools. It contains a log of HTTP client/server conversation and is very useful for an additional / off-line analysis.

HAR Viewer (HTTP Archive Viewer) is a tool for visualizing HAR file. It can be installed as a Chrome extension.

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