QuickBooks Error 12007 +1-855-510-6513 is an HTTP connection error that occurs when QuickBooks fails to establish a secure connection with the Intuit server. QuickBooks Error 12007 +1-855-510-6513 can happen during payroll updates, QuickBooks Desktop updates, or tax table downloads. QuickBooks Error 12007 +1-855-510-6513 is usually associated with firewall restrictions, proxy server misconfigurations, or SSL/TLS protocol errors.