QuickBooks Error 6000 usually occurs when a user is trying to open a company file. When this error occurs it display more than 4 digit error with the message indicating the errors. This error causes due to Windows firewall files access .TLG file might be damaged or corrupted. To this error try to Rename the .TLG files, and Re-configure the Windows Firewall access. Hope that the given solution helps you, but if not feel free to get in touch with our experts dial 844-888-4666.