AWSIoTPythonSDK/core/greengrass/discovery/providers.py [282:296]:
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        except AttributeError:
            # the getpeercert can throw Attribute error: object has no attribute 'peer_certificate'
            # Don't let that crash the whole client. See also: http://bugs.python.org/issue13721
            raise ssl.SSLError('Not connected')

        san = cert.get('subjectAltName')
        if san:
            have_san_dns = False
            for (key, value) in san:
                if key == 'DNS':
                    have_san_dns = True
                    if self._host_matches_cert(self._host.lower(), value.lower()) == True:
                        return
                if key == 'IP Address':
                    have_san_dns = True
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AWSIoTPythonSDK/core/protocol/paho/client.py [2420:2434]:
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        except AttributeError:
            # the getpeercert can throw Attribute error: object has no attribute 'peer_certificate'
            # Don't let that crash the whole client. See also: http://bugs.python.org/issue13721
            raise ssl.SSLError('Not connected')

        san = cert.get('subjectAltName')
        if san:
            have_san_dns = False
            for (key, value) in san:
                if key == 'DNS':
                    have_san_dns = True
                    if self._host_matches_cert(self._host.lower(), value.lower()) == True:
                        return
                if key == 'IP Address':
                    have_san_dns = True
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