The Management Console uses the HSM to protect the sensitive settings in the Appliance database while the HSM is in use. If the HSM is no longer needed, it still must be used one more time to decrypt these settings.
If you no longer want to use the Atalla HSM to derive cryptographic keys, the HSM must remain connected until you have disabled the setting on the Management Console. To disable the setting:
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Navigate to the System > Advanced page of the Management Console
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Unselect the Atalla HSM Enabled checkbox.
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Click Save Settings to apply this setting.
The Management Console now uses keys from a non-HSM district to protect its settings. The Atalla HSM is no longer used, and can be disconnected from the Appliance.