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How To Fix Quickbooks Error 6123

QuickBooks, an innovative accounting software enables real-time financial and operational insights and offers the ability to automate critical processes. Before getting into the troubleshooting steps, let’s understand the causes of error 6123 in QuickBooks. Follow simple solutions to know how to fix Quickbooks error 6123

How to fix QuickBooks error 6123

What’s Error 6123?

Error 6123 occurs usually occurs in a multi-user environment. The user may also face errors while opening the file directly from the network or restored backup. The error appears with the error message — ‘Connection to QuickBooks company file has been lost’.


Causes Of The Quickbooks Error 6123

  • When the QuickBooks data/files are damaged or corrupted.
  • The error can occur while restoring the backup from a flash drive or a removable storage device.
  • Running multiple instances of QuickBooks database service on your computer may also lead to such errors. 

Follow The Steps To Fix Quickbooks Error 6123:

  • Disable antivirus settings for 2 to 3 minutes and then restart your computer. This may resolve the issue.
  • Relocate the company file to another location.
  • Use a new window user. 

The above instructions are the quick-fix solutions for Error 6123 in QuickBooks. If the above steps don’t fix the error, then continue with the following solutions.


Solution 1: Quickbooks File Doctor Tool

  • Download and install the QuickBooks File Doctor tool on your device.
  • The QuickBooks File Doctor tool possibly displays damages in data/file causing Error 6123. 

Solution 2: QuickBooks Connection Diagnostic Tool

  • Download the QuickBooks Connection Diagnostic tool on your system.
  • Install and run the tool. The diagnostic tool will detect and show the error. Follow the on-screen instructions to fix the issue. 

Solution 3: Fix Damaged Data Files

  • Click on the Start button on your device and select Explore.
  • Check the company file and right-click with ‘. ND’ extension.
  • Rename the file to ‘.ndold.’
  • Do the following methods to switch to multiple user mode:
  • Navigate to the File menu, select Utilities from the drop-down list, and choose Stop Using Multi-User Access. 
  • Again, navigate to File and select Switch to Multi-user Mode. 

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