What does NTSTATUS 0xC0220026 (STATUS_FWP_MATCH_TYPE_MISMATCH) mean?

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A WFP match operation is not supported by the selected field or condition value type.

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STATUS_FWP_INVALID_WEIGHT	STATUS_FWP_TYPE_MISMATCH

STATUS_FWP_MATCH_TYPE_MISMATCH

The comparison operator and operand do not form a legal condition

STATUS_FWP_MATCH_TYPE_MISMATCH is emitted when the fieldKey, matchType, and conditionValue combination cannot be evaluated by WFP. Equality is broadly available, but ordering, range, flags, case-insensitive, and prefix-style operations have data-type restrictions.

Treat the condition as a three-part contract, not as a simple comparison expression. Record the field GUID and the exact FWP_MATCH_TYPE before changing the value. Replacing the operator with equality may silence validation but materially narrows a range or mask policy.

What to inspect

The field GUID, current layer, and the data type that the field accepts.
The exact FWP_MATCH_TYPE and whether its documented operand requirements are met.
The condition value type and serialized bytes or numeric representation.
A minimal test filter that preserves the desired semantics while isolating the invalid condition.

References

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