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Error 55 6 64: The connection to the QuickBooks company file has been lost

The following message appears when working with a company file that is stored on another computer.

The connection to the QuickBooks company file has been lost. Perhaps there has been a problem with the computer on which data file name resides. QuickBooks must shut down. (Error code: 55, 6, or 64).
Why this is happening

This occurs when the connection to the company file has been interrupted. Interference with the connection can be caused by:

  • Power management software in Microsoft Windows
  • Large screen saver programs, such as the Windows built-in 3D screen savers
  • Other programs that run in the background while your computer is running
  • A faulty network card or cable


These errors are generic Windows messages indicating that the specified network resource or device is no longer available. When a network connection is terminated while QuickBooks desktop has a company file open using that connection, an error appears indicating that the connection has been lost.

How to fix it

To resolve this issue, reboot the computer or server to reestablish a connection with the QuickBooks Desktop data file.

To prevent this issue from occurring in the future:

  1. Disable power management on the computer that is storing the data file:
    1. On your keyboard, press the Windows logo+R. The Run dialog box opens.
    2. Enter control then click OK.
    3. Double-click Power Options.
    4. On the Power Schemes tab, click the Power Schemes drop-down arrow and select Home/Office Desk.
    5. For all other settings on this tab, select Never.
    6. Click OK.
  2. Disable screen savers, especially the large 3D screen savers included in Windows.
    1. On your keyboard, press the Windows logo+R. The Run dialog box opens.
    2. Enter control then click OK.
    3. Double-click Display to open the Display Properties window.
    4. On the Screen Saver tab, click the Screen Saver drop-down arrow and select None.
    5. Click OK.
  3. Use the Windows Task Manager utility to close programs that run in the background. Because it can be difficult to trace the error to a specific program, try leaving all programs off temporarily as a test, and then reintroduce them one by one.
  4. Check your network card or cable. Try copying the company file to another computer on the network to see if accessing the file from a different location solves the issue. If you are not sure how to copy your data file to another computer, check with your network administrator (if you have one), your computer vendor, or a local computer consultant.
KB ID# SLN40489
12/5/2016 12:37:43 PM
QYPPRDQBKSWS08 9138 Pro 2017 a8cf03