QuickBooks error 12000 is a common update problem caused by failed internet connectivity. In this forum discussion, you’ll find quick troubleshooting tips such as reviewing system proxy settings, repairing Internet Explorer versions, and configuring SSL certificates correctly. Several users also note that improper firewall permissions often trigger error 12000. By joining this thread, you can engage with other QuickBooks community members who solved update and payroll connectivity problems already. If you would like live error troubleshooting for error code 12000, dial +1-866-408-0444 for timely solutions.