If the report will not respond to cancel, you will need to stop and start the cpservice.
service cpservice stop
wait for it to fully stop
service cpservice start
While the cpservice is stopped, users will not have access to the UI. If the report continues to hang, you should review the report and make corrections as necessary. Ensure reports are scheduled after hours and staggered. How many widgets/pages does the report have? Have you experienced this issue before with this report?
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