If you are upgrading to HMG/HSG version 3.2 or greater, due to a new restriction of TLS certificates in certain operating systems, a new self-signed certificate with a 2-year expiration should be generated after the upgrade. See "Cannot Access Web Interface from a Computer after an OS Update" in (3.8.1) Known Issues and Solutions for more details on the issue.
To generate a new self-signed certificate:
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In the side menu under Administration, click System Settings.
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Click Certificates in the navigation toolbar.
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Click the Generate button.
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On the Generate Certificate or Private Key dialog:
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Type in a name for the certificate.
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For the Type, select Self-Signed.
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Fill in the remaining fields. See (3.8.1) Certificate Settings.
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Click the Apply button.
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The new certificate is added to the Certificates list.
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Select the new certificate in the Active column to activate it.
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Optionally, delete the old certificate.
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Click Reboot for the change to take effect.