QuickBooks is an immaculate software, but you can end up facing errors while performing certain tasks. When You are performing a task and suffering from Error H2O2, then you can go with the following steps...
Step 1: Follow steps depending on how you host your company files
Hosting your own network
Hosting your own network with Windows Server 2012 Essentials R2
Step 2: Download and install the QuickBooks Tools Hub on your server
Step 3: From the Tools Hub, run the QuickBooks Database Server Manager on your server
Step 4: Check the services on your server
Step 5: Add services to your Windows admin group on your server
Step 6: Configure your firewall settings on your server
Step 7: Ping your server from a workstation
Step 8: Add your server to your Windows hosts file.