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E_ADS_INVALID_FILTER
E_ADS_INVALID_FILTER is a query-construction failure. ADSI search filters use LDAP filter grammar with parenthesized assertions and prefix logical operators such as &, |, and !; values and special characters must be encoded for filter context.
Inspect the generated filter as a protocol value
- Log the complete filter after all application escaping and concatenation, not the template before substitution.
- Check balanced parentheses and the required nested form for AND/OR/NOT expressions.
- Do not reuse distinguished-name escaping for filter assertion values; RFC 4515 defines a separate escaping model.
Microsoft also documents bitwise matching-rule syntax as attribute:OID:=value, with a decimal value and no spaces in the expression. These details are easy for generic query builders to violate. Before blaming an attribute or server, run the exact filter with the same base DN and scope. If user input contributes to the filter, encode it as an assertion value rather than allowing raw filter operators to enter the query.
ADSI search filter syntax · RFC 4515 LDAP filters · Generic ADSI errors
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