Do you want to know how you can fix the QuickBooks error 6123, 0? This article will discuss the QuickBooks error 6123 related to the company file Malfunctioning. When you see the Facebook company file is not responding correctly, there is a more significant possibility of getting such issue. This error indicates that the server connection between the QuickBooks company file has been lost due to poor internet service. However, it is possible to eliminate this error with proper guidance and precautions. But before following the steps to eliminate the QuickBooks error code 6123, you should be aware of what is the reason behind the error in your system.