I haven’t worked with S3 node before, but I set up S3 credentials to try to reproduce your issue. It turns out there are two nodes: S3 and AWS S3.
You are using the standard S3, is that what you meant to do? Unfortunately, I don’t have access to any S3-compatible servers, but I managed to connect to AWS S3 without any issues.
If you meant to use S3 node, check error detail, maybe there will be something useful:)