This error could be caused by a connectivity problem between your QuickBooks desktop and the server. The following are some of the most typical causes of Quickbooks h202: The hosting settings are incorrectly specified. The system firewall prevents the exchange of firm data between QB and the server. The DNS settings aren't set up incorrectly. QuickBooks Desktop does not have access to the Host or Server's IP address. QBCFMonitor and QuickBooksDBXX, for example, are not available. The.nd file in QuickBooks Database Server Manager is corrupted or damaged.