1. From a main Jenkins page, listing jobs, hover mouse over a target job, for dropdown triangle to appear.
2. Click triangle to open dropdown menu.
3. Select "Delete Project".
4. Choose "OK" in confirmation dialog.
HTTP ERROR 403
Problem accessing /jenkins/job/JOB/doDelete. Reason:
No valid crumb was included in the request
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This looks very similar to
JENKINS-18032, but that one apparently happened with "Delete" link on job information page. This one, again, happens in job lists, when using context/dropdown menu.