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Sophos XG admin console >> Chrome v58.0.3029.81 breaks HTTPS

I've been running Sophos XG for a year, always logging into the admin console via a bookmark in Chrome. Long ago installed the device cert, so HTTPS works like a charm. Until today.

After updating Chrome to v58.0.3029.81, I get the "Your connection is not private" warning when I click the aforementioned bookmark. Wording is as follows:

Attackers might be trying to steal your information from sophosappliancecertificate_foobar (for example, passwords, messages, or credit cards). NET::ERR_CERT_COMMON_NAME_INVALID

Clicking the ADVANCED link gives us a little more information:

This server could not prove that it is sophosappliancecertificate_foobar; its security certificate is from [missing_subjectAltName]. This may be caused by a misconfiguration or an attacker intercepting your connection.

Absolutely positively no changes EXCEPT the Chrome update: HTTPS worked before, does not work after.

Suggestions?

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