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Just noting for anyone who refers to this later that this will also be fixed in IRIS 2019.1.2 in addition to 2020.1.1

Calling into IRIS won't work if the instance is hung, so the only way to detect that is something external to the instance. Take a look at 'iris qlist'. You can get more information from 'iris help qlist', but here are the basics:

Syntax:
        iris qlist
Description:
        Quick list InterSystems IRIS registry information for all instances, in a format suitable for parsing in command scripts.

To add to this, given that you're concerned with security and want to use TLS 1.2, you should strongly consider upgrading, as 2012.1.2 has a number of security issues that have been fixed over the years.

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