QuickBooks error code H202 occurs when a user tries switching to a multi-user mode but the system fails to access the company file that is placed on a different workstation. QuickBooks H202 error can be fixed using some simple fixes. Firstly, you will need to test the network connectivity. For that, open the run window, type CMD and hit enter. Now when the command box opens type Ping [servername] and hit enter. If you receive a slow reply, that indicates the network needs attention to repair. You may also use the QuickBooks file doctor tool to resolve the network issues or reconfigure the firewall settings to add QuickBooks as an exception in the firewall.