"Server not responding" when creating a new account

I am creating Domino user accounts and getting “Server not responding” when I get 6 admins create Domino accounts all at the same time. How can I isolate this problem? If I create 1 Domino account one-at-a-time. the Domino server works fine. But my company has too many users/accounts to create each account that slowly.

Subject: “Server not responding” when creating a new account

Check the settings for the registration server for the cert process.

Subject: RE: “Server not responding” when creating a new account

Arno, Thanks for your reply. I am new to Domino, can you be more specific? What fields/values should I look for in the registration server?