QuickBooks Error H303 commonly happens when a user tries to open a company file from another workstation rather than the hosting computer. In this case, it indicates that the company file needs some additional configuration. There are various reasons behind this error like QuickBooksDBXX has not run, or there is some sort of misconfiguration .ND file. To solve the error restart the QuickBooks Database Server Manager and ping the server from a workstation. However, if the problem still persists get in touch with our experts (844)-888-4666.