QuickBooks Hosting Mode is Off can prevent other users from accessing a company file in multi-user mode. This usually happens when hosting is disabled on the computer storing the QuickBooks company file or when network settings are incorrectly configured. Open QuickBooks Desktop on the server computer and check the hosting settings under the File menu. Make sure hosting is enabled only on the appropriate server and that QuickBooks Database Server Manager is installed correctly. Also verify network permissions and firewall settings. Before changing network configurations, create a backup of your QuickBooks company file.
Visit:- https://dataserviceteam.com/quickbooks-hosting-mode-is-off/