If you are facing difficulty accessing the company file, it indicates you have fallen victim to QuickBooks connection has been lost error. You must have received the following error message when you tried to open QuickBooks:
“The connection to the company file has been lost. QuickBooks must close immediately. Any unsaved data will need to be re-entered.”
The error usually occurs because of a corrupted QuickBooks file and an unstable network connection. Read the entire blog carefully to learn more about connection error in QuickBooks. 
Are you too tired of QuickBooks connection has been lost error? Get immediate assistance from certified QuickBooks professionals by calling us on our helpline number +1-800-417-5147
Reasons why QuickBooks connection to the server has been lost
Go through the given list of factors that leads to connection issues in QuickBooks:
Windows firewall is blocking QuickBooks access over the network.
Power saving mode is enabled on your workstation.
The folder containing the company files needs additional permissions.
Following are the solutions that will help you resolve the issue.
Solutions to Solve Connection Error in QuickBooks 
Solution 1. Start QuickBooks Database Server Manager
Restarting the QuickBooks Database Server Manager on the server computer will help you resolve issues related to hosting as the server computer is the one that host the company file:
1. On your server computer, start QuickBooks and go to the company file.
2. Choose the Open or Restore Company option and then select Open a company file.
3. Search and open the company file.
4. Click Next.
5. Mark the Open file in the multi-user mode checkbox and then choose Open.
6. Log in to the company file and choose the File menu.
7. Select Close Company/Log off. It will close your company file on the server.
8. Click the Windows Start icon and in the search type Database.
9. Open the QuickBooks Database Server Manager.
If the solution given above doesn’t fix the error, move on to the next one.
You may also Read : QuickBooks error ps077
Solution 2. Fix connection error by running the QuickBooks File Doctor Tool
You might encounter the error due to an unstable network connection, and to fix this, run the QuickBooks File Doctor Tool, which is specially designed to resolve network and company file issues:
1. Quit QuickBooks and get the most recent version of the QuickBooks Tool Hub.
2. Move to Downloads and look for the downloaded QuickBooks setup file, i.e., QuickBooksToolHub.exe.
3. Begin the installation process by following the on-screen steps and selecting the agree to the terms and conditions checkbox.
4. Once the installation completes, the QuickBooks Tool Hub icon will show up on the desktop.
5. To open the Tool Hub, double-click the icon and then choose the Company File Issues tab.
6. Click Run QuickBooks File Doctor and scroll through the drop-down menu to choose your company file.
7. If you can’t find your file, click Browse and search to find it.
8. Select the middle Check your file option and click Continue.
9. Enter login credentials and click Next.
10. If you get the ‘No problem detected in your Company File’ message, your company file is good.
11. If the error message reappears, you need to rebuild it.
We appreciate your patience in dealing with the QuickBooks connection has been lost error, and we hope our blog helped you resolve it. If you didn’t find it helpful, you could always seek assistance from the certified QuickBooks expert’s team by dialing our toll-free number +1-800-417-5147. 
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