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Quickbooks File Repair — Error code: C=-6123, 0

QuickBooks error C=-6123, 0 means the connection to the QuickBooks company file has been lost. It commonly strikes when the file lives on another computer, a server, or a portable drive and the link to that storage is interrupted.

What -6123, 0 means

QuickBooks needs a stable, exclusive connection to the company file. The -6123, 0 code is raised when that connection drops -- whether the file is hosted remotely or accessed over a network. Sometimes the cause is environmental (a dropped network path), and sometimes it's the data inside the file that's damaged.

Common causes

  • The company file is stored on another computer or a portable drive and the connection to that storage was disrupted.
  • Windows power-management settings put the hosting computer into sleep or hibernation.
  • More than one computer on the network is configured to host the company file.
  • Computers in a multi-user install are running different versions of QuickBooks.
  • The data in the company file is damaged.

What you can safely try first

  • Move the company file to a local drive (or copy it locally) and open it there to rule out a network or removable-drive drop.
  • Adjust power-management settings on the hosting computer so it never sleeps or hibernates while the file is in use.
  • Confirm that only one computer is set to host the file, and that every machine runs the same QuickBooks version.
  • Reconnect or replace the cable/drive if you're working from a portable device.

When professional recovery is the safer path

If the connection settings are correct and -6123, 0 still appears, the company file itself is likely damaged. Our engineers can open the .QBW file and its .TLG log, repair the damage behind the lost-connection error, and return a file that opens reliably on your setup. The work is performed in-house in North America, and our no-data-no-charge policy means there is no cost if your data cannot be recovered.

See our QuickBooks data recovery service, or start a recovery and our team will review the file.