When accessing Amazon S3 buckets with a period (.) in their name, I get an error "51 - SSL: no alternative certificate subject name matches target host name". This error is caused by validation failure of the SSL certificate for the Amazon S3 servers.

During the setup even an error is displayed: "bucket can only consist of basic alphanumeric characters plus dot (.)". However the dots are also causing issues.

There are several other sites referring to this problem for example:
boto/boto#2836

[Thu May 28 12:09:29.491270 2015] [:error] [pid 837] [client x.x.x.x:58533] {severity:warn, description:"Uncaught exception (/var/www/openphoto/src/libraries/external/aws/lib/requestcore/requestcore.class.php:797): cURL resource: Resource id #24; cURL error: SSL: no alternative certificate subject name matches target host name 'trovebox.test.s3.amazonaws.com' (51)", additional:}, referer: http://ec2-x-x-x-x.eu-central-1.compute.amazonaws.com/setup/3