Resolve QuickBooks Error H202 with these steps: First, verify network connectivity and settings, ensuring all computers can communicate. Then, run QuickBooks File Doctor to detect and fix network issues. Next, configure firewall settings to allow QuickBooks connections. Ensure that QuickBooks services are running properly on all computers. Lastly, if using QuickBooks in multi-user mode, ensure hosting is turned on only for the server. These steps should help resolve Error H202 and restore normal QuickBooks functionality.
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