Quickbooks error 6123,0 QuickBooks is an innovative accounting software from Intuit used by millions of small and medium-sized businesses worldwide. According to Intuit, the Quickbooks error 6123,0 "Connection to the QuickBooks company file has been lost" generally occurs in environments with multiple users.
Causes of Quickbooks error 6123,0 It is possible that software company files will be damaged. A portable hard drive may have been used to restore company files. The network connection may be interrupted by the host server.