Manually Configure Update of a Virtual Appliance
The update of a VA results in the loss of DNS service for the duration of the update. We highly recommend that you perform updates during non-business hours, or preferably, deploy a second VA for this site to automate the process of updates without introducing VA downtime.
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Navigate to Connect > DNS Forwarders.
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Navigate to a Virtual Appliance and click the ellipsis (...), and then click Upgrade Virtual Appliance.
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For Upgrade Virtual Appliance, click Upgrade.