What is QuickBooks Error 6123 QuickBooks error code (-6123, -xxx), (-6123, 0) – “Connection to the QuickBooks Company file has been lost”  While using QuickBooks, you might encounter an error (-6123, -xxx), (-6123, 0), or a connection to the QuickBooks company file has been lost. This QuickBooks Error 6123 is bound to occur whilst establishing … Continue reading Fix QuickBooks Error Code -6123 0