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WHM / cPanel Backup to Amazon S3 Fails With Connection Error

I fought with this for too long before discovering the solution. I was getting a pretty standard connection error (as seen below). I had double-checked permissions, even going to far as to give full S3 permissions to my IAM user just to see if it would work, double-checking outbound firewall ports, etc. Everything checked out, but it still errored out.

WHM Backup to Amazon S3 - Connection Failed

My solution: My bucket name had dots in the name. S3 doesn't prevent this, but apparently it causes some sort of issue with the SSL connection. Create a new bucket with no dots, if you used them, and it will likely take care of your issue.

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