Hmm. You have two IP addresses for that domain name in your DNS. Do you have GoDaddy Domain Forwarding enabled? If so, you should disable that and ensure the IP A record is for the public IP of your system.
From the Let's Debug "verbose" output
A and AAAA records found for this domain
rocknas.net. 0 IN A 76.223.105.230
rocknas.net. 0 IN A 13.248.243.5
I know you said you used a CNAME but I don't see that. See below for GoDaddy DNS instructions