An uninterrupted internet connection is required to set up QuickBooks in a network for simultaneous access to the company file. All the workstation computers must be properly connected to the server computer to access the company file. Whenever an issue arises in the network set up or the connection between the server and the workstation computer, a “QuickBooks connection has been lost” error message appears on the user's screen. This common connection error can be resolved by identifying and troubleshooting the actual cause. For complete info on finding what is causing the error and how to rectify it, follow the entire article until the end.
If networking or troubleshooting is not your cup of tea, then you can reach QuickBooks support at 1.800.579.0391 for help getting rid of company file connection errors in QuickBooks
What causes QuickBooks to Lost Connection?

There are several reasons due to which a user might lose connection to the company file. Here is a list of them with an explanation.
Database server manager is required to scan and connect QuickBooks with the company file, and if it is not running, you will get the connection error in QuickBooks.
If the company file folder has been changed, then QuickBooks will not be able to locate the company file.
Windows firewall can also sometimes interrupt the connection between the company file and the workstation computer.
Resolving the causes mentioned above in the given order will eliminate the error in minutes. Follow the instructions given below to quickly eliminate the “QuickBooks connection has been lost” error message.
Also read : Quickbooks tool hub
Here’s How to Get Rid of QuickBooks Company File Connection Error

Solution 1: Restart QuickBooks Database Server Manager
Click the Windows Start button and type Database Server Manager in the search bar.
From the list of programs that appears on the screen, select QuickBooks Database Server Manager.
Select the option to browse the company file and select it.
Run QuickBooks Desktop and try to access the company file now.
Solution 2: Move QuickBooks Company File to the Correct Folder
If you have saved your company file to some folder other than the company file folder in the QuickBooks installation directory, copy it and paste it into the original company file folder.
Run QuickBooks and check if you are able to access the company file now.
If the error continues to bother you, follow the next troubleshooting solution.
Solution 3: Create Firewall Port Exception for QuickBooks
Open Windows Firewall settings.
Go to the Advanced settings.
Create Firewall Rules for incoming and outgoing connections.
Add QuickBooks firewall ports to the Windows Firewall.
Save the settings and try to access the company file once again.
In rare scenarios “QuickBooks connection has been lost” error message may reappear even after troubleshooting all the causes. If this happens in your case, you must contact QuickBooks support for help by dialing QuickBooks support number 1.800.579.0391.

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