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Error -6123, 0 when using QuickBooks Desktop

When opening or while using a QuickBooks Desktop company file over a network, in multi-user mode, or while restoring a backup, you see one or more of the following errors:

  • -6123,0
  • Connection to the QuickBooks company file has been lost


QuickBooks Canada customers, please see Error -6123, 0

If you are opening a backup from QuickBooks 2009 or older, see this article instead.

Why this is happening
  • A network connection with the host computer is disrupted.
  • Firewall settings prevent QuickBooks Desktop files from accessing the necessary ports.
  • Multiple instances of QuickBooks database service are running.
  • QuickBooks Desktop data or program files are damaged.
  • If the computer name where the data file is hosted has been changed while hosting was on.
  • If the McAfee Privacy Service is installed with the Block Web Bugs filter option selected. This filter conflicts with QuickBooks Desktop.
  • You are restoring a backup directly from a flash drive or other removable storage device to the local hard drive.
  • Your company file is damaged.
  • There is damage to the Windows user.
  • You are using QuickBooks Desktop 2016 and a 3rd party Sybase 16 application (ex. IDEXX Laboratories Cornerstone). In this circumstance you must contact the provider of the 3rd party software for help, or remove it entirely.
How to fix it

Intuit recommends 3 solutions for this problem based on how you are using QuickBooks when you get the error message.. The first solution may solve your problem, or you may need to try all 3 to resolve the issue. For best results, perform the solutions in the order shown.

KB ID# SLN40085
7/20/2017 11:29:25 AM
QYPPRDQBKSWS05 9138 Pro 2017 360063