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ERROR_IPSEC_MM_FILTER_EXISTS
ERROR_IPSEC_MM_FILTER_EXISTS (0x000032CE) A Main Mode filter with the requested identity already exists. The failure is usually caused by a repeated deployment or by creating the same peer selector in both local policy and Group Policy.
List Main Mode filters from all effective policy sources and compare their peer selectors. Resolve duplicate ownership between Group Policy, local policy, and automation so only the intended source manages that filter identity.
What to check
- Compare the existing filter selectors with the intended remote addresses, interface constraints, and authentication scope.
- Check whether a GPO already supplies the filter before adding a local duplicate.
- Make policy deployment idempotent: query first, then update the existing object when its settings must change.
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