Error: Company file is locked by another client

Is the Web Connector failing with the below message?


Message: Update aborted. Company file is locked by another client COMPUTER_NAME


This is typically caused by AutoRun being set to run too frequently. In your Web Connector, either turn AutoRun off, or set it for a larger value. This error is caused by this value being set too low (aka 10 minutes), and the Web Connector not having enough time to finish the previous task before starting the next sync. We recommend 45 or 60 minutes+ for the AutoRun value.

Another cause here can be if the Web Connector was force quit while running. It's recommended to not force quite the Web Connector while it's running.


The QuickBooks Company file will usually automatically unlock itself within a few hours, however, the below steps can also help force this unlock:

  • Restarting the QuickBooks POS computer(s).
  • Switching QuickBooks POS into Single User mode (File menu on the main QuickBooks POS company computer) - then back into Multi User mode.

If, after a few hours, the QuickBooks company file is not unlocked (aka, the same error above is occurring), you'll need to contact our support to help manually unlock the QuickBooks company file (with instructions we've received from QuickBooks POS Support).


-POS SDKTest Application

-Unlock.xml file


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