How to Fix QuickBooks Error H505 Multi-User Access

Written by michael clark  »  Updated on: July 10th, 2024

How to Fix QuickBooks Error H505 Multi-User Access

QuickBooks Error H505 is a common issue that arises when users try to switch to multi-user mode. This error typically indicates that the company file is on a computer that requires additional setup for multi-user access. Resolving this error is crucial for ensuring seamless collaboration and data sharing among team members. In this comprehensive guide, we will explore the causes of QuickBooks Error H505 and provide detailed steps to fix it.

Understanding QuickBooks Error H505

Error H505 is part of a series of H-series errors (H101, H202, H303, and H505) that are related to problems in hosting settings. Specifically, Error H505 occurs when:

• The server hosting the company file is not properly configured.

• QuickBooks cannot communicate with the server.

• The DNS settings are incorrect.

• The QuickBooks Database Server Manager is not running.

Symptoms of QuickBooks Error H505

Before diving into the solutions, it is essential to recognize the symptoms of Error H505:

• QuickBooks crashes or freezes frequently.

• You are unable to switch to multi-user mode.

• Error message H505 appears on the screen.

• The system slows down while working on QuickBooks.

Causes of QuickBooks Error H505

Understanding the causes can help in effectively troubleshooting the error:

1. Incorrect Hosting Configuration: The server or the host computer may not be set up correctly for multi-user access.

2. Firewall Settings: The firewall may be blocking communication between user computers and the server hosting the company file.

3. Damaged or Incorrect .ND Files: Network Data (.ND) files are crucial for accessing QuickBooks company files over a network. If these files are damaged or incorrect, they can cause Error H505.

4. DNS Issues: Incorrect DNS settings can prevent QuickBooks from connecting to the server.

5. QuickBooks Database Server Manager Not Running: This service must be running on the server hosting the company file.

Step-by-Step Solutions to Fix QuickBooks Error H505

Step 1: Verify Hosting Settings

Ensure that only the server (host computer) is set to host multi-user access and that no other computer is configured to host.

1. Open QuickBooks on all user computers.

2. Go to File > Utilities.

3. If you see Stop Hosting Multi-User Access, click on it. If you see Host Multi-User Access, do not click it.

Step 2: Check and Configure Firewall Settings

Your firewall may be blocking communication needed for QuickBooks to work in multi-user mode.

1. Open Control Panel and go to System and Security > Windows Defender Firewall.

2. Select Advanced Settings.

3. Right-click Inbound Rules and select New Rule.

4. Select Port and click Next.

5. Choose TCP and enter the specific ports required for QuickBooks:

o QuickBooks Desktop 2019: 8019, 56728, 55378-55382

6. Click Next, then Allow the Connection, and click Next again.

7. Ensure all profiles are checked, then name the rule and click Finish.

Repeat the steps for Outbound Rules.

Step 3: Verify .ND Files

Network Data files (.ND) allow QuickBooks to access a company file in a network or multi-user environment. Ensure these files are correct and not damaged.

1. Open the folder that contains your company file.

2. Find the files with the same name as your company files but with .ND extensions (e.g., company_file.qbw.nd).

3. Right-click each .ND file and select Delete.

4. Open QuickBooks Database Server Manager from the Start menu.

5. Scan the folder that contains your company files. This will create fresh .ND files.

Step 4: Configure QuickBooks Database Server Manager

Ensure that the QuickBooks Database Server Manager is running on the server.

1. Open the Start menu and type QuickBooks Database Server Manager.

2. Open the tool and click on the Scan Folders tab.

3. If no folders are listed, click on Add Folder and browse to the folder that contains your company files.

4. Click on Scan.

5. Ensure that the company files appear under QuickBooks company files found.

Step 5: Check DNS Settings

Incorrect DNS settings can prevent QuickBooks from connecting to the server.

1. Open the Command Prompt as an administrator.

2. Type ipconfig /flushdns and press Enter.

3. Restart your computer and try to switch to multi-user mode again.

Step 6: Edit Windows Hosts File

Manually configuring the Windows hosts file can resolve network-related issues.

1. Open Notepad as an administrator.

2. Go to File > Open and navigate to C:\Windows\System32\drivers\etc.

3. Select All Files from the drop-down menu and open the host’s file.

4. Add the IP address and computer name of the server hosting the company file.

5. Save the changes and close Notepad.

Step 7: Restart QuickBooks Services

Restarting QuickBooks services can resolve issues related to multi-user mode.

1. Open the Run window (Windows + R) and type services.msc.

2. Find and restart the following services:

o QuickBooksDBXX (where XX is the version number)

o QBCFMonitorService

3. Right-click each service and select Restart.


Fixing QuickBooks Error H505 is essential for ensuring smooth multi-user access, which is critical for collaborative work environments. By following the steps outlined in this guide, you can effectively troubleshoot and resolve the error, allowing your team to resume their work without interruptions.

If the issue persists despite following these steps, consider contacting QuickBooks support for further assistance. Professional help can provide more in-depth solutions tailored to your specific setup, ensuring that your QuickBooks environment runs efficiently and without errors.

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