A frequent problem that arises when a user tries to view a company file that is on a different computer is QuickBooks Error H505. Usually, this problem means that QuickBooks cannot connect to the server that is hosting the company file. This error can be caused by a number of things, such as improper DNS settings, damaged QuickBooks files, firewall problems, or inappropriate hosting configurations. There are several fixes you can try to fix QuickBooks Error H505. First, make sure that the computer storing the corporate file is the only one with hosting enabled. Second, make sure QuickBooks can reach your firewall by configuring its settings. The QuickBooks File Doctor tool is another option for automatically fixing errors. These procedures can help you fix Error H505 QuickBooks.