QuickBooks Error 6000-83 is a common company file error preventing users from opening, backing up, or restoring their company file, usually signaling issues like a damaged file, incorrect network settings, especially multi-user hosting, insufficient folder/user permissions, or firewall interference blocking access to the file on a server. It means QuickBooks can\'t properly reach or access the file, often occurring with messages like, An error occurred when QuickBooks tried to access the company file.