To fix QuickBooks Error Code H505, begin by confirming that the company file is hosted only on the server and not on any workstations, and ensure all systems are connected to the same network. Update QuickBooks Desktop to the latest version, then check that QuickBooksDBXX and QBCFMonitorService are running properly on the server. Verify that the correct firewall ports are open to allow QuickBooks communication and that the server’s IP address is correctly listed in the .ND file. Running the QuickBooks File Doctor can help diagnose and repair network-related issues. If the error still occurs, contact QuickBooks support at +1 (302) 205-4658 for expert assistance.
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