First of all, thanks for building such a promising plugin - I'm really hoping we can solve this problem so we can try it out with our set-up!
Everything seems to work perfectly on our local server, but as soon as the installation is on a remote server we are receiving this error on the Amazon S3 and CloudFront settings page:
Error retrieving a list of your S3 buckets from AWS: [curl] 60: [url] https://s3.amazonaws.com/
(See here for a screenshot: https://www.dropbox.com/s/5125iuvz14lk3xf/Screen%20Shot%202014-01-13%20at%2017.24.34.png)
After searching various results on Google, the fix seems to point towards configuring cURL to accept any server certificate, because Amazon do not have a valid SSL.
However, we're having trouble finding where you are executing cURL in your plugin. This blog post seems to explain the possible problem: http://unitstep.net/blog/2009/05/05/using-curl-in-php-to-access-https-ssltls-protected-sites/
Have you heard of any other issues regarding the error retrieving the bucket list?