Fixing Docker app connection issues

I created a docker container for the docker app jbartlett777_diskspeed. It runs but I cannot connect to it. I’ve verified the ports its using via docker ps command. Its ports 8080:18888. Every time I try to connect I get the error “connection refused”. I have disabled both the NAS firewall and my windows pc firewall. I am using a bridge network connection. I’ve tried both http:// and https://. Both fail. Anyone have any suggestions?