When QuickBooks Desktop tries to connect to the company file but can't communicate with the server for one of the following reasons, Quickbooks Error h202 appears.

The hosting setup parameters are incorrect.

Incoming and outgoing communication is blocked by the server computer's firewall.

DNS server is in conflict.

The IP address of the host system or server holding the corporate file is unavailable to QuickBooks.

On the server machine, some internal QuickBooks services such as QuickBooksDBXX and QBCFMonitor aren't running.

The network data file (.ND) has been damaged or corrupted.