dnat porta 53_tcp

ASG 8,202,
I created a DNAT for ssh, 22, and 53 for the service DSN, to my server behind ASG.

If I telnet to port 22 works, if I telnet to tcp 53 is not working, why?
There 'a mistake?

Port 53 is open locally, because if you launch NMAP is present.

thanks