Can't access instance after launching from AMI

Following your tutorial here, I’m able to set up the pre-baked AMI on a t2.small type but am not able to access the public IPs (either the IP address or the DNS). Getting “ERR_CONNECTION_REFUSED”. I first tried us-west-2, now in us-west-1 but both not working. The associated security group is open to all IPs on port 80 (HTTP) and 443 (HTTPS). Have read through the other posts here but haven’t been able to remedy yet. Any advice is much appreciated!