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An NZB download from an indexer that does not complete, either because the indexer returned an error page instead of XML or because the quota for the day was already spent. Automation tools log it and move to the next indexer in priority order. A grab that succeeds but yields articles the provider no longer holds is a different problem, showing up later as missing segments.
Browse all terms in NZB Files & Indexing, or see the full Usenet glossary.