gsutil failed to rsync from S3 with "." bucket name

Getting the following message when rsyncing from S3 to google storage, not sure if this is an issue with the cert or the bucket name ?

gsutil rsync -d -r s3://mybucket.prod gs://mybucket-courses

"Caught non-retryable exception while listing s3://mybucket.prod/: Host mybucket..prod.s3.amazonaws.com returned an invalid certificate (remote hostname "mybucket..prod.s3.amazonaws.com" does not match certificate): {'notAfter': 'Oct 25 12:00:00 2016 GMT', 'subjectAltName': (('DNS', '_.s3.amazonaws.com'), ('DNS', 's3.amazonaws.com')), 'subject': ((('countryName', u'US'),), (('stateOrProvinceName', u'Washington'),), (('localityName', u'Seattle'),), (('organizationName', u'Amazon.com Inc.'),), (('commonName', u'_.s3.amazonaws.com'),))}"