Error H505 basically occurs when the user tries to access the company file, which is not in their computer. Improper configuration of the file could also be a reason for this error. If you are encountering this issue, you can refer to the steps mentioned below to fix it: Step 1: You need to verify the hosting process Step 2: Ensure that the services of QuickBooks are running Step 3: You will be required to make changes to the firewall settings Step 4: Create a new QuickBooks company folder in the host computer You can follow these steps to fix QuickBooks error H505. If the error still persists, you can get in touch with QuickBooks support number to seek assistance from the professional experts who help you to fix your problem very soon. https://www.contactforquickbooks.com/