@jamesjohnsonusa

If you're seeing the QuickBooks H505 Error while trying to access your company file in multi-user mode, you're likely dealing with a network or hosting configuration issue. This error prevents workstations from connecting to the computer that hosts the QuickBooks company file, interrupting collaboration and delaying essential accounting tasks.
https://www.indiehackers.com/post/unable-to-access-multi-user-mode-fix-quickbooks-h505-error-0e17ab724a