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WU_E_REBOOT_IN_PROGRESS
WU_E_REBOOT_IN_PROGRESS means the machine is already restarting and Windows Update cannot safely start or continue the requested action. It is a timing and system-state condition rather than an update-content failure.
What to do
- Wait for the reboot to complete, then begin a new update detection or installation request.
- Check whether management tooling schedules overlapping reboot and update actions.
- If the status appears repeatedly without a restart completing, investigate the broader shutdown or servicing state in the logs.
Microsoft: Windows Update Agent API reference
Microsoft: Windows Update log files
Microsoft: Windows Update error reference
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