Backup Exec 15 Error with Amazon S3 Config

Hello everyone,

I've seen a thread open by @Lazo86 and resolved by @BackupMikko which describe the exact problem I'm having right now, but for me that solution isn't working. Here it's the link: http://www.symantec.com/connect/es/forums/backup-exec-15-error-amazon-s3-config

In my case, once I write the server name (amazon:amazon.com) and the user/password to connect to the AWS Bucket I have this error message:

My O.S. is Windows Server 2012 R2 and my Backup Exec 15 is Ver. 14.2 Rev. 1180. And, of course I've downloaded and changed the CloudProvider.xml file.

Thanks in advance.