Do you want to know how to fix Quickbooks errors? The main cause of the QuickBooks Error 15222 is that the software is unable to create a reliable network connection with the server in order to download the updated files. It includes an error message that indicates this problem is present. This issue can also happen if your software is not updated to the most recent version or if Internet Explorer is not the default browser. You can install a digital signature or make Internet Explorer your preferred browser to fix this problem.