To fix QuickBooks Error Code H303, first make sure the company file is hosted only on the server and that hosting is turned off on all workstations. Verify that all computers are connected to the same network and that QuickBooks Desktop is updated to the latest version. Check that QuickBooksDBXX and QBCFMonitorService are running on the server and set to automatic. Use the QuickBooks File Doctor to scan and repair network configuration issues, and ensure that required firewall ports are open so QuickBooks can communicate with the server. If the problem continues, you can contact QuickBooks support at +1 (302) 205-4658 for professional assistance.
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