Cannot connect to S3

I am getting the following error when trying access the sample S3 for the tutorial:

Unable to execute HTTP request: Connect to [] failed: Connection refused: connect

I am behind a corporate firewall, so I have added the -Dhttp.proxyHost=http://… and -Dhttp.proxyPort=8080 arguments to the DREMIO_JAVA_EXTRA_OPTS parameter, but I am still seeing the same issue.

You can also try to add proxy information through the S3 source directly as well. More info -