The error message may also appear as "Error -6123, 0" or "Connection to the QuickBooks company file has been lost". To fix this error, users can try various troubleshooting steps, such as running the QuickBooks File Doctor tool, disabling antivirus software, updating QuickBooks to the latest release, or manually repairing the company file. It's essential to take timely action to resolve this error and prevent data loss or corruption This segment covers everything to know about error 6123 and resolution steps. Users can avail of additional assistance and guidance for the issue by reaching out to a QB expert at +1(855)-738-0359