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Quickbooks connection has been lost, then we are here to support

You may see the accompanying mistake while opening or utilizing QuickBooks: 
Association Has Been Lost: The association with the organization record has been lost. QuickBooks should close instantly. Any unsaved information should be re-entered.
Quickbooks, blunder
Why this is occurring
You will see this blunder message when your  Quickbooks connection has been lost programming can never again get to your organization record. It resembles a dropped approach your mobile phone: The companion you were conversing with is still there, yet the association is no more. You may need to get back to your companion, or you may need to settle an issue with your telephone.
There are a few conceivable foundations for the blunder. You may just have the capacity to restart your PC and your server. Or then again, you may need to ensure QuickBooks is designed appropriately and that all your equipment is as yet working. This article gives connects to apparatuses you can download and directions to help discover and settle the issue. To start with, pick the arrangement beneath that portrays where the blunder happened. At that point pick the alternative that best portrays your setup.
Essential: If you see this mistake while refreshing your organization document to another variant, please go to Connection to the QuickBooks Company File has been lost.
error message: “(- 6123,0) Connection to the QuickBooks organization record has been lost.” 
This issue can happen for a few reasons:
The system association is lost.
Firewall or other system settings are keeping QuickBooks records from getting to the essential ports.
The QuickBooks organize information record (*.ND) is harmed or missing.
The host PC went into Standby or Hibernate mode, making the association the organization document to be upset.
Numerous examples of the QuickBooks database benefit are running.
The organization information record is harmed.
The QuickBooks establishment records are harmed.
We prescribe you endeavor the accompanying arrangements altogether, retrying QuickBooks each time.
Check the system associated with the host PC if there is an issue then call on our toll-free number 1877-249-9444  
In the event that you have a hard-wired system, check the system associations and links on both the host PC and the customer PC attempting to get to the organization record to ensure they are secure.
Check that different projects or assets put away on the host PC are accessible. If not, restarting the PCs may resolve the issue.
Note: If restarting the PCs reliably settle the issue, you may have a progressing association issue on the system. In light of the unpredictability and assortment of both wired and remote PC systems, Intuit can’t offer help for your system arrangement. It would be ideal if you counsel with your framework or system overseer (in the event that you have one), the merchant who set up the system, or a nearby PC specialist to investigate availability issues in your PC and system condition.
Arrange your system programming and equipment to enable QuickBooks to get to records
On the off chance that you are utilizing firewall programming or system equipment like a switch, design your system to enable QuickBooks to get to the right ports for the accompanying records.
For more points of interest, see the documentation for your system equipment and programming.
McAfee Privacy Service
In the event that you are utilizing the McAfee Privacy Service, you will likewise need to impair the Block Web Bugs channel. The accompanying advances depict how to do as such in the 2006 variant of the McAfee Privacy Service; in the event that you utilize an alternate form, contact McAfee Support for encouraging help
Open the McAfee Security Center.
Select the Privacy Service tab on the left side.
Select Configure Privacy Service Options, and select the Options tab.
Select the Block Info tab, and uncheck the Block Web Bugs on this Computer alternative.
Close McAfee Security Centers.
Open QuickBooks in multi-client mode.
Note: Intuit does not give specialized help to outsider applications that incorporate information with QuickBooks work area programming. Contact the outsider proprietor, engineer, or seller for questions in regards to the information combination processor for specialized help for the application that offers information with QuickBooks.
Fix a harmed or missing ND document 
On the PC that is facilitating the QuickBooks organization document:
Right-tap the Windows Start catch and select Explore.
Peruse the envelope that contains the organization record.
Right-tap the record that has an indistinguishable name from your organization document and the record expansion .nd (for instance, MyCompanyFile.nd) and snaps Rename.
Change the document name expansion to .ndold (for example, MyCompanyFile.ndold), and after that press Enter.
Open QuickBooks and open the organization document. QuickBooks will make another system information petition for the organization record.
Recuperate from standby mode by flipping facilitating now and again at the host PC
On the PC that is facilitating the QuickBooks organization document:
Open QuickBooks
On the host PC running QuickBooks, go to the File menu and snap Switch to Single User Mode.
Go to the File menu, click Utilities, and after that snap Stop Hosting Multi-client get to.
Go to the File menu, click Utilities, and after that snap Start Hosting Multi-client get to.
Go to the File menu and snap Switch to Multi-User Mode.
Note: If you can’t flip facilitating now and again, restart the PC in Safe Mode With Networking and attempt once more.
To keep the association with your organization record from being disturbed, later on, you should need to incapacitate or reconfigure the host PC’s rest, standby, or hibernation settings. For more data, allude to your PC’s client manual or help framework.
Stop and restart the QuickBooks database benefit
On the PC that is facilitating the QuickBooks organization document:
Stop the database server process:
Right-click a clear space on the Windows Taskbar and select Task Manager.
Tap the Processes tab.
Tap the Image Name section making a beeline for sort the passages in order.
Right-click qbdbmgrn.exe and select End Process.
Close Task Manager.
Open the Computer Management window:
Microsoft Windows Vista:
Tap the Microsoft Windows Vista logo (the Start catch).
Right-click Computer, and afterward select Manage.
Note: You may be required to enter your manager secret word.
Windows XP: Right-tap the My Computer symbol on your work area and select Manage.
Restart the database server process:
In the Computer Management window, tap the + image next to services and Applications to extend the area.
Select Services.
In the Services window, tap the Name segment making a beeline for sort the sections sequentially.
Right-tap the QuickBooksDB17 benefit and select Start.
Close the Computer Management window.
Check the organization petition for information harm.
See our different articles on settling information harm.
Repair harmed QuickBooks establishment documents
Close any open projects.
Embed your QuickBooks CD in the CD drive. In the event that the QuickBooks establishment window opens, close it.
Tap the Windows Start catch and select Control Panel.
Open the Add or Remove Programs window:
Windows Vista: Under Programs, click Uninstall a program.
Windows XP: Double-click Add or Remove Programs.
In the rundown of as of now introduced programs:
Windows Vista: Right-tap the QuickBooks program you need to repair and select Repair.
Windows XP: Select the QuickBooks program you need to repair and snap Change/Remove.
At the point when the QuickBooks Installation Wizard opens, click Next.
Select Repair, and afterward click Next. QuickBooks repairs the establishment.
After the repair is finished, click Finish, and restart your PC if provoked to do as such.
In the event that repairing the QuickBooks establishment does not resolve the issue, play out a clean uninstall and reinstall of QuickBooks.