Manually Unregistering Endpoints
The following procedure describes how to manually unregister an endpoint from the Endpoints list.
The unregistered endpoint's metadata and screenshot data is still retained inside the database - data already collected. will not be lost by unregistering.
If any activity was detected on the endpoint during the last 24 hours, you cannot unregister it via the Web Console; you can only perform this action from the endpoint itself.
To manually unregister an endpoint via the Web Console
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Navigate to Configuration > Endpoint Management > Endpoints.
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Click the Endpoints tab.
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In the Endpoints list, click
next to the endpoint that you want to unregister to expand the details, and click the Unregister link. 
A message is displayed, prompting you to confirm your action.
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Click OK to proceed.
The Agent version status is changed to Unregistered. This frees up one license, allowing you to use that license to install an Agent on a new machine.
A system event "Agent was unregistered from the Web Console" is generated and will be viewable in the System
Related Topics:
Automatically Unregistering Endpoints