How to fix QuickBooks error H505?

Configure Firewall settings in the QuickBooks. Follow these simple steps:- Navigate on the start button displaying on the screen. Input control Panel in search box. Now, open the Control panel window. Check for firewall settings & open it. Go to allow a program with Firewall. Later, choose the Add Program. You need to put the list of exceptions - QuickBooks 20xx. Restart your system to update the changes. Some issues with QuickBooks Helpline Number.