Fix QuickBooks Error 6073 99001: Easy Troubleshooting Guide 

QuickBooks is one of the most widely used accounting software platforms, especially among small and medium-sized businesses. However, like any complex application, it can run into errors. One such frustrating issue is QuickBooks Error 6073 99001, which usually occurs when a user attempts to open a company file that is already open on another computer in single-user mode.

What Is QuickBooks Error 6073 99001?

QuickBooks Error 6073 99001 typically occurs when you're trying to access a company file, and QuickBooks detects that the file is already open on another computer, often in Single User Mode. The software then restricts access to avoid data corruption or version conflicts.

You may see an error message like:

"QuickBooks is unable to open this company file. It may have been opened by another user. You should ask that user to switch to multi-user mode. Error codes: (-6073, -99001)"

This error is part of the -6000 series of errors in QuickBooks, which generally relate to issues in accessing company files.

 Common Causes of QuickBooks Error 6073 99001

To troubleshoot effectively, it helps to understand what could be causing the issue. Here are the most common reasons:

1. Company file is open in single-user mode on another workstation.
   
   

2. The file is located on a read-only network folder.
   
   

3. Multiple users trying to access the same file without multi-user setup.
   
   

4. Remote desktop session left open with the company file active.
   
   

5. Damaged or corrupt .ND and .TLG files.
   
   

6. Firewall or security settings are blocking access.
   
   

7. Network Data file misconfiguration.
   
   

How to Fix QuickBooks Error 6073 99001 – Step-by-Step

Now, let’s walk through a series of troubleshooting steps to fix this error.

 Method 1: Use QuickBooks File Doctor

QuickBooks Tool Hub includes a File Doctor tool, which is excellent for resolving common file and network-related issues.

Steps:

1. Download QuickBooks Tool Hub:
   
   

   • Visit Intuit’s official site and download the latest version.
     
     

   • Install it by following on-screen instructions.
     
     

2. Launch the Tool Hub.
   
   

3. Click on “Company File Issues.”
   
   

4. Select “Run QuickBooks File Doctor.”
   
   

5. Browse and select your company file.
   
   

6. Choose “Check your file and network.”
   
   

7. Enter your QuickBooks admin credentials.
   
   

8. Let the tool run and repair any found issues.
   
   

Note: File Doctor may take a few minutes depending on file size.

Method 2: Switch to Multi-User Mode

If the file is open in single-user mode on another computer, ask that user to switch to multi-user mode.

Steps:

1. Go to the workstation where the file is currently open.
   
   

2. In QuickBooks, click on:
   File → Switch to Multi-user Mode
   
   

3. Try accessing the file again from your system.
   
   

If you are unable to identify the active user, use the QuickBooks Admin Console to log out all users or restart the server.

 Method 3: Verify Hosting Settings on All Systems

Only the server (host) should have hosting turned on.

Steps:

1. On each workstation:
   
   

   • Open QuickBooks.
     
     

   • Go to File → Utilities.
     
     

   • If you see “Host Multi-User Access,” leave it (means hosting is off).
     
     

   • If you see “Stop Hosting Multi-User Access,” click it to disable hosting.
     
     

2. On the server or main host computer:
   
   

   • Make sure “Host Multi-User Access” is enabled.
     
     

This ensures QuickBooks works in multi-user mode only via the host.

Method 4: Rename .ND and .TLG Files

Corrupted configuration files can trigger the error.

Steps:

1. Go to the folder containing your company file (usually under C:\Users\Public\Documents\Intuit\QuickBooks\Company Files).
   
   

2. Locate files with the same name as your company file but with extensions:
   
   

   • .ND (Network Data)
     
     

   • .TLG (Transaction Log)
     
     

3. Rename each file:
   
   

   • Right-click the file → Rename
     
     

   • Add .old at the end (e.g., companyfile.qbw.nd.old)
     
     

QuickBooks will regenerate fresh versions of these files the next time you open the company file.

Method 5: Use QuickBooks Database Server Manager

Make sure the database server is scanning the correct folder.

Steps:

1. Open QuickBooks Tool Hub.
   
   

2. Go to Network Issues tab.
   
   

3. Click on QuickBooks Database Server Manager.
   
   

4. Click Browse and select the folder containing your company file.
   
   

5. Click Start Scan.
   
   

6. Once the scan is complete, try opening the company file again.
   
   

Method 6: Manually Set Folder Permissions

Make sure the folder where the company file is stored has full access permissions.

Steps:

1. Right-click the folder containing your company file → Properties.
   
   

2. Go to the Security tab.
   
   

3. Click Edit → Choose Users group.
   
   

4. Ensure all permissions (Read, Write, Modify) are allowed.
   
   

5. Click Apply and OK.
   
   

 Method 7: Restart Remote Desktop Session

If the file was previously opened in a Remote Desktop session, it could still be locked.

Steps:

1. Log into the remote computer.
   
   

2. Open Task Manager → Users tab.
   
   

3. Log off the user session that has QuickBooks open.
   
   

4. Reconnect and reopen the file.
   
   

 Method 8: Check for Software Updates

Outdated QuickBooks versions can be incompatible with newer operating systems or security settings.

Steps:

1. Open QuickBooks.
   
   

2. Go to Help → Update QuickBooks Desktop.
   
   

3. Select Update Now, then click Get Updates.
   
   

4. Restart QuickBooks once updates are installed.
   
   

Pro Tips to Avoid QuickBooks Error 6073 99001 in the Future

To avoid facing this issue again, consider the following best practices:

• Always close your company file properly before logging off.
  
  

• Ensure users are educated on Single vs. Multi-user modes.
  
  

• Use the QuickBooks Database Server Manager for multi-user environments.
  
  

• Avoid opening QuickBooks through a mapped drive; use UNC paths instead.
  
  

• Regularly back up your QuickBooks files.
  
  

When to Contact a Professional

If none of the methods work, the issue might be deeper—like file corruption or system-level permission issues. In such cases, you should:

• Contact QuickBooks Support directly.
  
  

• Consult a certified QuickBooks ProAdvisor.
  
  

• Use data recovery services for inaccessible company files.
  
  

 Conclusion

QuickBooks Error 6073 99001 is a frustrating but fixable error, mostly caused by file access conflicts in a multi-user environment. By following the steps outlined above—from using the File Doctor tool to checking hosting settings and renaming configuration files—you should be able to resolve the issue without needing professional help.

Frequently Asked Questions

1. What does QuickBooks Error 6073 99001 mean?

Answer:
QuickBooks Error 6073 99001 means the software is unable to open your company file, usually because it's already open in Single User Mode on another system. It can also occur due to incorrect file permissions, damaged support files, or network issues.

2. Can I fix Error 6073 99001 without technical help?

Answer:
Yes, in most cases, you can resolve Error 6073 99001 by following simple troubleshooting steps like switching to Multi-User Mode, using the QuickBooks File Doctor, checking hosting settings, and renaming the .ND and .TLG files. If the problem persists, it may require assistance from a QuickBooks ProAdvisor or technical expert.

3. How do I prevent QuickBooks from showing this error in the future?

Answer:
To prevent this error:

• Make sure all users close QuickBooks properly.
  
  

• Enable Multi-User Mode before multiple users access the file.
  
  

• Only host the company file on the designated server.
  
  

• Keep QuickBooks and your system up to date.
  
  

• Use QuickBooks Database Server Manager to scan your company file directory regularly.

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