When a company file cannot access the database server, "QuickBooks Error H505" happens. This is frequently the result of network problems or improper configuration. Usually, it interferes with multi-user mode, making the file inaccessible. To fix it, make sure the QuickBooks Database Server Manager is configured correctly and check firewall permissions and network settings. Please call us at +1.833.802.0002 if you want to talk to a QuickBooks support specialist right now