When the program is unable to connect to the internet for updates, QuickBooks Error 12002 happens. This is frequently caused by firewall, network, or security settings. Payroll or program update downloads may be interrupted by this problem. Checking internet connections, modifying firewall settings, or setting up QuickBooks to permit online communication are often the steps involved in fixing it. Do you require assistance with QuickBooks? For assistance, contact an expert at 1.855.738.2784.