When a user attempts to view a company file on a different computer and QuickBooks is unable to establish a connection with the server, QuickBooks Error H505 occurs.  Usually, it signals hosting or network problems.  Configuring hosting settings, verifying firewall permissions, and making sure QuickBooks services are operating on the server are all necessary to resolve this error.  For professional QuickBooks help over the phone, dial 1.855.738.2784.