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Are you encountering QuickBooks Error 6123 when opening a company file or restoring a backup? This error is common and affects many users. It typically occurs when you open a company file on your local system, access it in a multi-user setup, or restore a backup file.

QuickBooks may display the following message on the screen:

“Error -6123, 0: QuickBooks has lost its connection to the company file.”

This message indicates that QuickBooks is unable to establish a stable connection with the company file. Several file or network-related issues can trigger this error. We will discuss these causes later in this article.