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QuickBooks Error H202 occurs when QuickBooks fails to communicate with the server in multi-user mode. This issue is typically caused by network or configuration problems. To resolve it, ensure the server hosting the company file is correctly configured for multi-user access, check firewall settings, verify that the QuickBooks Database Server Manager is running, and troubleshoot network issues like IP or DNS misconfigurations. Running QuickBooks File Doctor from the QuickBooks Tool Hub can also help diagnose and fix the error