Error adding a China s3 source

[Wayaye]

I referred to this post:

Can't add s3 data source

I am using dremio-community-4.0.1-201909191652190301_211720e_1.noarch.rpm I have dremio (single node) running aws ec2 (under company vpc), server is up and I am able to login to dremio UI and create postgres data source and run query. When I try to create aws s3 data source with option “ec2 metadata”, it failed. UI showed "Failure while configuring source [rlin-test]. And server log showed: “Connect to sts.us-east-1.amazonaws.com:443 [sts.us-east-1.amazonaws.com/54.239.16.72] failed: connect…