QuickBooks® Error H303: Company File Network Location

What is QuickBooks® Error H303?

QuickBooks® Error H303 is a network connectivity error that occurs when a workstation cannot locate or reach the server computer hosting the company file. This is different from Error H202 (which indicates communication problems) — H303 specifically means QuickBooks® cannot find the server at all on the network, often due to DNS resolution issues or incorrect network configuration. For a complete setup guide, see our Multi-User LAN Setup guide.

First Checks for Error H303

Detailed Solution Steps

1. Verify Network Connectivity.

   Test if the workstation can reach the server:

   1. On the workstation, open Command Prompt (Windows + R → cmd)
   2. Type: ping [server-computer-name]
   3. Press Enter and observe the results
   4. If you get replies, the connection works but there may be DNS issues
   5. If you get "Request timed out" or "Could not find host", there's a connectivity problem
   6. Ensure both computers are on the same network and subnet
2. Get Server IP Address and Computer Name.

   Gather server information needed for configuration:

   1. On the server computer, open Command Prompt
   2. Type: ipconfig and press Enter
   3. Find "IPv4 Address" - this is your server's IP address (e.g., 192.168.1.100)
   4. Write down this IP address
   5. Type: hostname and press Enter
   6. Write down the computer name (e.g., SERVER1 or QUICKBOOKS-SERVER)
3. Update Windows Hosts File on Workstation.

   Add server information to hosts file for DNS resolution:

   1. On the workstation, open Notepad as Administrator (right-click → Run as administrator)
   2. Click File → Open
   3. Navigate to: C:\Windows\System32\drivers\etc
   4. Change file type dropdown to "All Files (*.*)"
   5. Open the file named "hosts" (no extension)
   6. At the bottom of the file, add a new line:
   hosts file entry

   Copy

   192.168.1.100    SERVER1

   7. Replace the IP and name with your server's actual IP and computer name
   8. Save the file (Ctrl+S)
   9. Close Notepad
   10. Restart the workstation or flush DNS: ipconfig /flushdns

   Important: Make sure there's at least one space (or tab) between the IP address and computer name. Both must be on the same line.

4. Configure QuickBooks® Database Server Manager.

   Ensure Database Server Manager is properly configured:

   1. On the server, open QuickBooks® Database Server Manager
   2. Go to the "Scan Folders" tab
   3. If your company file folder is not listed, click "Add Folder"
   4. Browse to and select the folder containing your company file
   5. Click "Scan" and wait for the process to complete
   6. Verify new .ND files are created next to your company file
5. Verify Firewall Settings.

   Ensure Windows Firewall allows QuickBooks® connections:

   1. On the server, open Windows Defender Firewall with Advanced Security
   2. Click "Inbound Rules" on the left
   3. Look for rules containing "QuickBooks®" or "QBW"
   4. If missing, create new rules for ports: 8019, 56728, and your version-specific ports
   5. For testing, you can temporarily disable the firewall to see if it's blocking
   6. Re-enable firewall after testing and create proper rules
6. Test Connection from Workstation.

   Verify the fix worked:

   1. On the workstation, ping the server again using computer name
   2. It should now resolve to the correct IP address
   3. Open QuickBooks® on the workstation
   4. Navigate to the company file (via network path or mapped drive)
   5. Open the file - it should open without H303 error
   6. Test basic operations to ensure proper connectivity

Why Does Error H303 Occur?

How to Prevent Error H303

Frequently Asked Questions

Related Resources