According to Intuit, QuickBooks Error 12007 mainly occurs when you are attempting to download the Payroll or QuickBooks Desktop updates. An error message “Error 12007: a network timeout that is preventing QuickBooks from accessing the server” displays on your screen. What are the causes of QuickBooks error 12007? Error 12007 QuickBooks can occur due to many reasons such as – If the internet is not working accordingly then, you may have problems in downloading the updates. Firewall settings or antivirus will not let you run QuickBooks. When the Internet Explorer settings are not configured. When QuickBooks does not support Web browser. If the SSL settings are incorrect.