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STATUS_FWP_DUPLICATE_AUTH_METHOD
The IPsec policy contains duplicate authentication methods
WFP rejects redundant authentication-method lists. The same method repeated inside one policy is a configuration error and should be removed rather than retried.
Review the authentication-method list for repeated entries introduced by policy merge or generation. Remove the duplicate at its source so the effective proposal contains each intended method only once.
What to inspect
- Deduplicate machine, user, certificate, Kerberos, or preshared-key methods.
- Check policy merge code that appends methods repeatedly.
- Compare generated policy before and after Group Policy refresh.
References for STATUS_FWP_DUPLICATE_AUTH_METHOD
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