Mikronode won't connect if I pass a domain instead of an Ip Address

[Scientistt]

I tested the PHP api codes and sometimes its more handy for my to use a domain instead of an IP address since IPs can change and I always have to update the sistema with the new IP.
When I put a domain on Mikronode it says that could not resolve the host name, but the same thing works on the PHP API.

Am I doing some thing wrong or maybe misconfiguration?