Troubleshooting internet connection issues, firewall settings, and having mulitple instances of QuickBooks installed on the computer.

It is sometimes necessary to uninstall and reinstall all other Intuit programs in the QuickBooks installation folder (as well as QuickBooks),  if QuickBooks does not function correctly after a reinstallation. This is referred to as a clean install.

Steps for resolving error -6190, -83 error, which can happen when more than one computer is set to host the same company file.