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FWP_E_DUPLICATE_AUTH_METHOD
FWP_E_DUPLICATE_AUTH_METHOD means an IPsec policy repeats an authentication method. It is usually caused by merging profile fragments or retry logic that appends instead of replacing configuration.
What to check
- Deduplicate methods by their policy identity before committing the configuration.
- Inspect the final WFP policy after Group Policy, local policy, and application policy are combined.
- Keep fallback methods explicit and ordered rather than inserting multiple identical entries.
Microsoft: capture IPsec events with netsh wfp
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