I am using Connect Registry > Generic Docker Registry
URL for registry: http://us.icr.io
Username: iamapikey
Password:
Error: "Error: request to http://us.icr.io/v2/ failed, reason: connect ECONNREFUSED 103.41.70.140:80"

I face no issues trying to connect to the same registry host from the CLI:
docker login -u iamapikey -p us.icr.io/v2/