AWSIoTPythonSDK/core/greengrass/discovery/providers.py [298:310]:
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                        return

            if have_san_dns:
                # Only check subject if subjectAltName dns not found.
                raise ssl.SSLError('Certificate subject does not match remote hostname.')
        subject = cert.get('subject')
        if subject:
            for ((key, value),) in subject:
                if key == 'commonName':
                    if self._host_matches_cert(self._host.lower(), value.lower()) == True:
                        return

        raise ssl.SSLError('Certificate subject does not match remote hostname.')
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AWSIoTPythonSDK/core/protocol/paho/client.py [2436:2448]:
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                        return

            if have_san_dns:
                # Only check subject if subjectAltName dns not found.
                raise ssl.SSLError('Certificate subject does not match remote hostname.')
        subject = cert.get('subject')
        if subject:
            for ((key, value),) in subject:
                if key == 'commonName':
                    if self._host_matches_cert(self._host.lower(), value.lower()) == True:
                        return

        raise ssl.SSLError('Certificate subject does not match remote hostname.')
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