Good evening, @gckaccounting .

Thanks for reaching out to the Community. 

To clarify, how many computers are affected by this error? Have you recently updated QuickBooks? Typically when we see error H202, its when we try switching from single user to multi-user mode. When this error occurs, this means something is blocking the connection to your server (host computer). There are several steps that we can take to resolve this:

1. Install/Update the QuickBooks Database Server manager from your host computer.
2. Check the services on your server.
3. Add services to your Windows admin group on your host computer. 
4. Configure your firewall settings on your host computer. 
5. Ping your server from a workstation. 
6. Add your server to your Windows hosts file. 

It is best to have your IT professional perform the steps above. You can connect with our technical support team as well. They have the tools available to remote into your computer and investigate the issue securely. Please note: The technical support agent will need access to your host computer (The computer that contains the company file). 

Follow the guided steps in How to fix error H202 and H505. 

Let me know if you have additional questions or concerns. I'll be here every step of the way. You can reach out to the Community any time. Take care and enjoy the rest of your week!