Quickbooks h202 can occur for a variety of reasons, as detailed in the following list:
QuickBooks is unable to reach the server due to restrictive firewall or Internet security settings.
QuickBooks is unable to communicate with the company file due to a lack of firewall port setting.
QB error H202 can also be caused by incorrect hosting setup settings in QuickBooks.
When QuickBooks Database Server Manager clashes with the DNS server, the network data (.ND) file is damaged or corrupted.