QuickBooks Error 6000 83 occurrence when QB user try to open the company files, restores the company file and want to create a backup. Firstly configure the Firewall or security software settings then verify the company files access permissions. Create network descriptor file and scan the company file folder. Disable the multi-user access. Now try to open company file from a location other than original one. If file is open in other location than copy and restore it to actual location. If not contact QuickBooks Error 6000 83 support team at 844-888-4666.