AWS instance created successfully, but getting error testing it

[Juan-cc]

I created a fresh new AWS instance using:
https://github.com/gochain-io/docs/blob/master/private-networks/aws/gochain-cf-stack.yaml

and when I try to test it using:
curl -X POST -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"web3_clientVersion","params":[],"id":67}' http://18.220.163.196:8545

I am getting:
curl: (7) Failed to connect to 18.220.163.196 port 8545: Connection refused

Seems like a AWS permission/security issue but not sure how to fix this. Any idea why would this happen?

In addition, if I ssh to the instance and I check the genesis file, it seems to be corrupted.

NOTE: the content of the genesis file is the following text: 404: Not Found

My AWS security group looks like: