The issue happens when you try to transfer agents with a mismatched certificate. When you log in to the OfficeScan 11.0 console, you will see a blue notification on the dashboard stating a certificate mismatch. This means the agents were unable to secure communication from the server, causing the failure to move them to the new server.

To resolve the missing or mismatched certificate issue, follow the procedure in this article: "OfficeScan Agents do not have a valid OfficeScan Server certificate" appears on the dashboard.