QuickBooks Error H202 occurs when QuickBooks cannot establish the connection needed for Multi-User Mode. The problem is commonly related to the host computer, network connection, Database Server Manager, firewall, or hosting configuration. QuickBooks Error H202 usually appears when you try to switch to Multi-User Mode and QuickBooks cannot connect to the computer that hosts the company file. The error means something is blocking communication between the workstation and the host computer. This can prevent multiple users from opening and working on the same QuickBooks company file. Fortunately, you can try several troubleshooting steps to restore the connection.