# How to Resolve QuickBooks Error H101, H303, and H505 in Multi-User Mode

QuickBooks multi-user mode allows multiple users to work on the same company file simultaneously. However, configuration or network issues can cause Error H101, H303, or H505 to appear, preventing access to the file hosted on the server. If you encounter any of these errors and need immediate assistance, you can reach third-party QuickBooks support at **1-888-394-9046** for guided troubleshooting.

What Do These Errors Mean?

These H-series errors indicate that QuickBooks cannot communicate with the server hosting the company file:

Error Code Meaning
H101 Workstation requires additional configuration to open the file
H303 QuickBooks needs help establishing a connection with the server
H505 Hosting settings on the server are incorrect or blocked

All three prevent multi-user access, disrupting productivity.

Common Causes of H101, H303, and H505

Incorrect hosting configuration

Firewall or antivirus blocking QuickBooks ports

Damaged .ND files

Inactive QuickBooks Database Server Manager

Network or DNS misconfiguration

Insufficient file or folder permissions

Step-by-Step Solutions
1. Verify Hosting Settings

QuickBooks should host files only on the server:

On every workstation:
Go to File → Utilities → Stop Hosting Multi-User Access

On the server:
Enable Host Multi-User Access

2. Add Firewall Exceptions

Open required ports in Windows Firewall, including:

8019, 56728, 55378–55382

Then allow QuickBooks services such as:

QBW32.exe

QBDBMgrN.exe

QBCFMonitorService.exe

3. Run QuickBooks Database Server Manager

Open QuickBooks Tool Hub

Select Network Issues

Start the Database Server Manager

Scan the folders containing your company file

This restores proper network permissions.

4. Rename .ND and .TLG Files

These files help QuickBooks connect in multi-user mode. If corrupted:

Open the folder containing your .QBW file

Locate files ending in .ND and .TLG

Right-click each → Rename → add .old

New files generate automatically when QuickBooks starts again.

5. Test Network Connectivity

Press Windows + R → type cmd

Type:

ping [ServerName]

If the reply fails, the workstation cannot locate the server, indicating network issues that must be resolved.

When to Seek Expert Help

If these steps do not eliminate Error H101, H303, or H505, the issue may involve:

Windows Server roles

Damaged QuickBooks installation files

Incorrect domain configuration

These situations often require professional support.

Conclusion

QuickBooks Errors H101, H303, and H505 are common multi-user mode issues caused by network and hosting misconfigurations. By correcting firewall settings, verifying hosting options, and repairing .ND files, you can restore seamless access to your company file.

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