If you encounter the ? The connection to the corporate file has been lost. QuickBooks must close immediately. Any unsaved data will have to be re-entered? message, it means your QuickBooks is affected with ?QuickBooks connection has been lost?. Although QuickBooks allows users to experience a stress-free operation, sometimes problems like connectivity issues trigger, which restrict the users from accessing the application. If you're also incurring similar issues, we recommend you bear this blog till this end for a close understanding. If you further require some technical assistance from a QB expert then dial this toll-free number +1-855-856-0042.