I opened nginx error.log file and found this:
2014/10/03 08:49:36 [error] 23770#0: *56382 FastCGI sent in stderr: "PHP message: PHP Fatal error: Uncaught exception 'cURL_Exception' with message 'cURL resource: Resource id #14; cURL error: SSL: no alternative certificate subject name matches target host name 'code.hotels-bank.com.s3.amazonaws.com' (cURL error code 51). See
http://curl.haxx.se/libcurl/c/libcurl-errors.html for an explanation of error codes.' in /home/lorddaedra/www/hotels-bank.com/core/model/aws/lib/requestcore/requestcore.class.php:848
Stack trace:
#0 /home/lorddaedra/www/hotels-bank.com/core/model/aws/services/s3.class.php(723): RequestCore->send_request()
#1 /home/lorddaedra/www/hotels-bank.com/core/model/aws/services/s3.class.php(1383): AmazonS3->authenticate('code.hotels-ban...', Array)
#2 /home/lorddaedra/www/hotels-bank.com/core/model/modx/sources/mods3mediasource.class.php(110): AmazonS3->list_objects('code.hotels-ban...', Array)
#3 /home/lorddaedra/www/hotels-bank.com/core/model/modx/sources/mods3mediasource.class.php(142): modS3MediaSource->getS3ObjectList('/')
#4 /home/lorddaedra/www/hotels-" while reading response header from upstream, client: 128.68.59.15, server: hotels-bank.com, request: "POST /connectors/index.php?action=browser/directory/getList&id=/ HTTP/1.1", upstream: "fastcgi://unix:/var/run/php5-fpm.sock:", host: "hotels-bank.com", referrer: "
http://hotels-bank.com/manager/?a=system/event"
Also I found this topic
https://www.drupal.org/node/1673888
"Error with bucket names containing dots (.) over SSL"... This is fixed in SDK 1.6.2, the path generated is slightly different.
ModX use old SDK 1 (summer 2011)... Please, update SDK to latest
https://github.com/amazonwebservices/aws-sdk-for-php at least (it's no longer in development anyway), much better, if you will update to SDK2
https://github.com/aws/aws-sdk-php