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WU_E_PT_REFRESH_CACHE_REQUIRED
WU_E_PT_REFRESH_CACHE_REQUIRED means that the server changed or the client cookie became invalid. The intended recovery is to refresh the protocol state and start a new operation, not to assume that Windows system files are damaged.
Recommended response
- Retry the scan after the client has re-established its state with the update service.
- Check for a WSUS service change, migration, load-balancer change, or policy transition at the failure time.
- Investigate the first preceding service or communication error if the code repeats after a clean retry.
Microsoft: WUA networking error codes
Microsoft: Windows Update log files
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