App - System

when i use NC to try that

Host challenge03.root-me.org
Protocol TCP
Port 56529

i get NO response
is that the server down ？i could not even connect thet server。

When something similar happens you can check the state of different root-me services on this link:
https://www.root-me.org/?page=structure&inc=inclusions%2Fservices&lang=en
(there is a button in the upper edge of web-site next to FAQ, Shop and others)

i check for that maybe this server ban some ip