Starting with vSphere 6.7, a vCenter Server alarm notifies you when an ESXi host's encryption mode has become disabled. You can re-enable the host encryption mode if it has become disabled.
- Verify that you have the required privileges:
- Before re-enabling encryption mode, troubleshoot the cause and attempt to fix the problem manually.
- Connect to vCenter Server by using the vSphere Client.
- Navigate to the ESXi host's Summary tab.
When the encryption mode is disabled, the Host Requires Encryption Mode Enabled alarm appears.
- Decide if you want to either acknowledge the alarm, or reset the alarm to green but not re-enable the host encryption mode now.
When you click either Acknowledge or Reset to green, the alarm goes way, but the host's encryption mode remains disabled until you re-enable it.
- Navigate to the ESXi host's Monitor tab and click Events to get more information on why encryption mode is disabled.
Perform suggested troubleshooting before you re-enable the encryption mode.
- On the Summary tab, click Enable Host Encryption Mode to re-enable host encryption.
A message appears, warning that encryption key data is transmitted to the host.
- Click Yes.