HRESULT 0x0004092F (IDS_MON_DEFAULT_ERROR): meaning and diagnosis

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the catalog SQL parser rejected the query before the search engine could execute it.

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VFW_S_DVD_RENDER_STATUS	IDS_MON_ILLEGAL_PASSTHROUGH

IDS_MON_DEFAULT_ERROR

IDS_MON_DEFAULT_ERROR belongs to the catalog query parser path. Microsoft documents this parser family as syntax-related failures surfaced by the OLE DB provider during command execution. The useful evidence is therefore the exact submitted query and provider error text, not the number of indexed documents or crawl state.

Reduce the query to the failing grammar element

Capture the SQL string exactly as passed to the provider, including quotes, commas, parentheses, and generated aliases.
Start from a minimal SELECT ... FROM SystemIndex statement and add the WHERE, grouping, and ordering clauses back one at a time.
Do not diagnose this as an index corruption code unless a separate catalog error is also present; a parser failure occurs before result evaluation.

Windows Search SQL has a defined clause structure and a deliberately smaller grammar than a general database server. Query builders should log the final SQL after escaping and parameter expansion. A query that looks correct in application templates can become invalid after an empty property name, unmatched quote, or unsupported clause is inserted. The parser message returned with the OLE DB error is usually more actionable than retrying the same command.

Parser error reference · Windows Search SQL overview

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