When many users are unable to view a company file at the same time, QuickBooks Multi-User Mode Not Working happens. Incorrect hosting settings, firewall restrictions, or network issues are the causes of this problem. Configuring hosting settings, verifying server access permissions, upgrading QuickBooks Database Server Manager, and making sure there is adequate network connectivity are all necessary to fix it. Contact our team of QuickBooks specialists at 1.855.738.2784 if you need help.