If your QuickBooks company file won’t open in multi-user mode, network communication issues may be blocking access. Common reasons include incorrect hosting settings, damaged network files, DNS conflicts, or firewall restrictions.QuickBooks Error H202 usually appears when the workstation cannot connect to the server computer. To fix it, verify hosting, scan with Database Server Manager, and check firewall permissions. Need expert support? Call +1(866)500-0076 for quick assistance.