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QuickBooks may be blocked by Windows Firewall, limiting access to necessary features including database management, payroll, and multi-user mode. Use the QuickBooks File Doctor tool, open the required ports (such 8019 and 56728-56730), setup the QuickBooks Database Server Manager, and add QuickBooks to the Windows Firewall exception list to resolve issue. Additionally, check network connectivity, restart QuickBooks' services, and make sure everything is updated. Disabling Windows Firewall or antivirus software for a short while can aid in problem diagnosis.
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