Use the Rescan option to restart an On Demand registry scan. You cannot restart scan jobs in Queued or Running state.
1) Go to Assets > Registries and select Edit for any registry in your list.
2) Go to Scan Jobs for the selected registry.
3) Identify the scan you want to start again, and choose Rescan from the Quick Actions menu or from the Actions menu above the list.
A new scan job will be created and will appear on the Scan Jobs list with a status of Created.