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  • What version of Excel are you using? That message sounds like general workbook security and not connection specific. It is telling you all external connection is disabled. Is the document trusted in the Trust Center? Commented Apr 28, 2016 at 16:25
  • Excel 2010, .xlsx format. The document that spurred this questions is not trusted in the Trust Center. Commented Apr 28, 2016 at 17:53