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WU_E_SERVER_BUSY
WU_E_SERVER_BUSY means the server rejected an event because it was under too much load to accept it. The client should not assume the event was recorded; repeated immediate retries can worsen the overload.
What to check
- Use retry with backoff and verify whether later reporting succeeds.
- Correlate the client timestamp with update-server capacity, IIS, database, or service-health information in a managed environment.
- Separate this reporting failure from download or install failures, which may be unaffected.
Microsoft: Windows Update log files
Microsoft: Windows Update Agent API
Microsoft: Windows Update error reference
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