QuickBooks Error H202 – How to Resolve It? If you are facing the issue QuickBooks Error H202, this issue occurs when database server manager gets damaged which leads to an error or a security firewall interfering and hindering QuickBooks from connecting to the servers and failing to open or start because the database server manager has stopped working. You can try to log out from QuickBooks and reboot your system, and if you still face the issue, in this blog, we will discuss possible reasons for QuickBooks Error H202 and how you can solve the issue step by step.