QuickBooks Error 12007 usually happens when payroll services or software are updated.  It is frequently brought on by problems with internet connectivity, improper browser settings, or firewall limitations.  QuickBooks is unable to connect to the server because of this issue.  It can be fixed by configuring firewall and security software, updating Internet Explorer, and verifying network settings. Call 1.855.738.2784 for expert QuickBooks phone support.