QuickBooks error 12007 is one of the very unusual issues due to poor network connection, which doesn’t allow QB to connect to the server. To resolve QuickBooks Error 12007, first, you will have to ensure a fast internet connection. Sometimes, restarting the router fixes the problem, or you might have to reset the QuickBooks update settings. The QB error code 12007 also links with firewall security settings, which hampers the QuickBooks operation. Using Internet Explorer as a default browser will also help you eliminate the QuickBooks error 12007.