If you're seeing QuickBooks Error H505 while trying to access a company file located on another computer, don't worry—you're not alone. This error typically signals a problem with the multi-user hosting setup or network configuration. In this complete 2025 repair manual, we'll help you troubleshoot and fix the issue step by step.

Fix QuickBooks Error H505 fast with this 2025 repair manual. Step-by-step troubleshooting tips. Call support at +1(866)409-5111 for expert help.

What Is QuickBooks Error H505?

QuickBooks Error H505 occurs when a user tries to open a company file that’s not located on their system but is hosted on another computer (server). It usually appears with a message saying QuickBooks can't connect to the server.

This error is part of the H-series errors (H101, H202, H303, H505) and is linked to incorrect settings that block multi-user mode.

Why Does QuickBooks Error H505 Happen?

Understanding the root causes helps resolve it quicker. Here are the most common triggers:

• Incorrect hosting settings on the workstation.
• Blocked communication ports by firewall or antivirus.
• Damaged or incorrect .ND (Network Data) file.
• QuickBooks services (QBCFMonitor or QuickBooksDBXX) not running.
• Issues with DNS or server IP settings.

How to Identify QuickBooks Error H505

You’ll typically encounter the following symptoms:

• QuickBooks crashes while opening a company file in multi-user mode.
• You get a pop-up stating: “This company file is on another computer, and QuickBooks needs some help connecting.”
• The server can’t be found.
• Multi-user mode doesn’t work.

QuickBooks Error H505 Troubleshooting Steps