resolve QuickBooks Error 6073 99001 with step-by-step troubleshooting. Restore company file access and fix multi-user mode issues quickly
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QuickBooks Error 6073 99001: Step-by-Step Troubleshooting Guide
Introduction: Understanding QuickBooks Error 6073 99001
QuickBooks Error 6073 99001 is a common multi-user mode error that prevents you from opening your company file. When this error occurs, you typically see the message: "QuickBooks is unable to open this company file. It may have been opened by another user. Error codes: (-6073, -99001)" .
This error occurs when there is a conflict in file access, such as:
The company file is open in single-user mode on another workstation
The file is stored in a read-only network folder
Remote access sessions are keeping the file locked
File corruption or damaged .ND/.TLG files
If you need immediate expert assistance with QuickBooks Error 6073 99001, contact certified professionals.
Common Causes of QuickBooks Error 6073 99001
Cause Explanation
Single-User Mode Conflict The file is open on another computer in single-user mode
Read-Only Folder The company file is located in a network folder with read-only permissions
Remote Access Sessions LogMeIn, GoToMyPC, or similar tools leave the file locked
Linux Server Conflicts Multiple login credentials accessing the same shared folder
Corrupted .ND/.TLG Files Damaged network data or transaction log files
Incorrect Hosting Settings Multi-user hosting is not properly configured
Symptoms of QuickBooks Error 6073 99001
Error message: "QuickBooks is unable to open this company file"QuickBooks crashes when opening the company file
File appears locked even when no other users are online
QuickBooks freezes during file access attempts
Multi-user mode fails to load properly
Step-by-Step Solutions to Fix QuickBooks Error 6073 99001
Solution 1: Run QuickBooks File Doctor
The QuickBooks File Doctor is Intuit's primary tool for fixing company file and network issues .Steps:
Download the latest QuickBooks Tool Hub from the official Intuit website
Install and launch the Tool Hub
Select Company File Issues from the menu
Click Quick Fix My File first as a quick option
Then select Run QuickBooks File Doctor
Choose your company file from the dropdown or browse for it
Select Check your file and network (recommended)
Enter your QuickBooks admin password and click Next
Wait for the scan to complete (may take 10-20 minutes)
Note: If QuickBooks File Doctor does not open automatically, search for it manually in Windows and open it .
Solution 2: Manually Resolve Single-User Mode Conflicts
If the error is caused by single-user mode conflicts, use this approach :Case 1: File open on another workstation in single-user mode
Close QuickBooks on all computers in the network
Open the company file on the Host computer only
Go to the File menu and select Switch to Multi-User Mode
If the issue persists, reboot all workstations
Case 2: File open in single-user mode on the Host computer
Go to the File menu and select Close Company
Reopen the file: File → Open or Restore Company
Select Open a company file and click Next
Select your company file
Choose Open file in multi-user mode and click Open
Solution 3: Check and Fix Folder Permissions
If the company file is in a read-only folder, adjust permissions :Navigate to the folder containing your company file on the host computer
Right-click the folder and select Properties
Go to the Security tab
Select the user experiencing issues and click Edit
Check Allow for the following permissions:
Full Control
Modify
Read & Execute
Read
Click Apply and OK
Solution 4: Run Quick Fix My Program
Remote access sessions can leave phantom users logged in :Open the QuickBooks Tool Hub
Select Program Problems from the menu
Click Quick Fix My Program
Wait for the repair process to complete
Restart QuickBooks and try opening your company file
Solution 5: Rename .ND and .TLG Files
Damaged network data files can cause this error :Close QuickBooks completely
Open the folder containing your company file
Locate files with the same name as your company file but with .ND and .TLG extensions
Right-click each file and select Rename
Add .old to the end of each filename
Reopen QuickBooks—fresh .ND and .TLG files will be created automatically
Solution 6: Verify Hosting Settings
Only the server should host multi-user access :On the server computer, open QuickBooks and your company file
Go to File → Utilities → Host Multi-User Access
Select Yes and click OK
Verify that hosting is disabled on all workstations
Reboot all computers and try accessing the file again
Frequently Asked Questions (FAQs)
Question Answer
What is QuickBooks Error 6073 99001? A multi-user mode error preventing company file access, typically caused by single-user mode conflicts, read-only folders, or network issues
How do I fix QuickBooks Error 6073 99001? Run QuickBooks File Doctor, switch to multi-user mode, adjust folder permissions, or rename .ND/.TLG files
Can remote access cause this error? Yes. Remote software like LogMeIn or GoToMyPC can leave sessions active, locking the file
Is my company file at risk? No. Your financial data is safe. The issue is with file access and network configuration, not data corruption
What if none of the solutions work? Contact professional support for advanced troubleshooting
Final Conclusion
QuickBooks Error 6073 99001 is a common but completely fixable multi-user mode error. By following the step-by-step solutions in this guide—running QuickBooks File Doctor, switching to multi-user mode, adjusting folder permissions, and renaming .ND/.TLG files—you can quickly restore access to your company file.If you are unable to resolve QuickBooks Error 6073 99001 on your own, professional support is available.