Inventory dependencies
List the control panel, extensions, databases and scheduled services on the old server. Record which components require independent licenses. A control panel license does not automatically transfer every add-on.
Verify the target first
Check the new operating system and public address against the intended package. Plan data backup and restoration before changing live traffic. Confirm any IP-change limits before the migration window.
Validate before retiring
Check services, account access and license activation on the target. Keep the rollback plan until the required checks pass. Do not terminate the old license merely because DNS has been changed.