QuickBooks Error -6073, -99001: Complete Solutions Guide for 2026
Fix QuickBooks Error -6073, -99001 quickly with our expert guide. Get instant help at +1-888-209-3999. Learn causes, solutions & prevention tips for seamless accounting in 2026.
Fix QuickBooks Error -6073, -99001 quickly with our expert guide. Get instant help at +1-888-209-3999. Learn causes, solutions & prevention tips for seamless accounting in 2026.
QuickBooks Error -6073, -99001 is one of the most frustrating issues that accounting professionals and business owners encounter while accessing their company files. This error typically appears when multiple users attempt to access the same company file simultaneously, or when there are underlying database connectivity problems. Understanding the root causes and implementing effective solutions can save you valuable time and prevent data loss.
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When you encounter QuickBooks Error -6073, -99001, you'll typically see a message stating that another user is already accessing the company file in single-user mode. This QuickBooks database error prevents legitimate access to critical financial data, disrupting your workflow and potentially affecting business operations.
The error code -6073, -99001 specifically indicates that the QuickBooks Database Server Manager is experiencing difficulties communicating with your company file. This can stem from various factors including corrupted network data files, incorrect hosting configurations, or damaged company files.
Several factors can trigger this persistent error:
Improper hosting configuration: When multiple computers are set to host company files simultaneously
Corrupted .ND and .TLG files: These network data files may become damaged over time
Firewall interference: Security settings blocking QuickBooks from accessing necessary ports
Damaged company file: File corruption due to unexpected shutdowns or system crashes
Outdated QuickBooks version: Running obsolete software versions incompatible with current systems
Only the server computer should host the company file. Follow these steps:
Open QuickBooks on each workstation
Navigate to File menu, then select Utilities
If you see "Host Multi-User Access," do not click it
If you see "Stop Hosting Multi-User Access," click it immediately
Repeat this process on all workstations except the server
The .ND and .TLG files often cause this QuickBooks company file error:
Close QuickBooks on all computers
Navigate to the folder containing your company file
Locate files with extensions .ND and .TLG
Right-click each file and select Rename
Add ".OLD" to the end of each filename
Restart QuickBooks Database Server Manager to regenerate these files
QuickBooks File Doctor is a powerful diagnostic tool:
Download the QuickBooks Tool Hub from the official Intuit website
Install and launch the Tool Hub
Select Company File Issues
Click on Run QuickBooks File Doctor
Select your company file and click Check your file
Enter your QuickBooks admin password when prompted
Allow the tool to scan and repair your file
Ensure QuickBooks has proper firewall permissions:
Add QuickBooks as an exception in Windows Firewall
Configure ports 8019, 56728, and 55378-55382 for QuickBooks communication
Temporarily disable antivirus software to test connectivity
Create inbound and outbound rules for QuickBooks executable files
Preventing QuickBooks Error -6073, -99001 is easier than fixing it:
Regularly update QuickBooks to the latest release
Maintain proper backup schedules for all company files
Ensure only one computer hosts the company file
Verify network stability and connection quality
Run periodic file maintenance using QuickBooks utilities
Train users on proper multi-user access protocols
QuickBooks Error -6073, -99001 doesn't have to halt your business operations. By understanding the causes and implementing the solutions outlined above, you can restore access to your company files efficiently. Remember to maintain regular backups, keep your software updated, and configure your network settings properly. When in doubt, professional help is just a phone call away at +1-888-209-3999.
Q1: What does QuickBooks Error -6073, -99001 mean?
This error indicates that QuickBooks cannot access the company file because it believes another user is accessing it in single-user mode, or there are network data file issues preventing proper database connectivity.
Q2: Can I fix this error without losing my data?
Yes, absolutely. The solutions provided above are designed to resolve the error without compromising your financial data. Always maintain current backups as a precautionary measure.
Q3: How long does it take to resolve this error?
Most users can resolve the issue within 15-30 minutes by following the step-by-step solutions. Complex cases may require professional assistance available at +1-888-209-3999.
Q4: Why does this error keep coming back?
Recurring errors often indicate underlying network issues, improper hosting configurations, or corrupted company files that need deeper investigation and repair.
Q5: Will this error affect my financial data?
The error itself doesn't damage your financial data, but it prevents access. Properly resolving it ensures your data remains intact and accessible to authorized users.