QuickBooks error H202 multi-user mode appears when a workstation can't communicate with the server hosting the company file during network access. It typically results from incorrect hosting settings, blocked firewall ports, or stopped QuickBooks services. Fix it by confirming hosting is enabled only on the server, running QuickBooks Database Server Manager, and restarting the QuickBooksDBXX and QBCFMonitorService services. The company file itself remains safe throughout this connectivity issue.