Hello Everybody.
Today I found out how to get rid of "Failed to get host name" error.
!!! DO NOT FORGET TO USE "Run as administrator" if you use Windows 7 or Vista !!!
Step 1.
Go to Windows -> system32 -> drivers -> etc -> hosts.
Verify if is "clean"
# Copyright (c) 1993-1999 Microsoft Corp.
#
# This is a sample HOSTS file used by Microsoft TCP/IP for Windows.
#
# This file contains the mappings of IP addresses to host names. Each
# entry should be kept on an individual line. The IP address should
# be placed in the first column followed by the corresponding host name.
# The IP address and the host name should be separated by at least one
# space.
#
# Additionally, comments (such as these) may be inserted on individual
# lines or following the machine name denoted by a '#' symbol.
#
# For example:
#
# 102.54.94.97 rhino.acme.com # source server
# 38.25.63.10 x.acme.com # x client host
Step 2
Go to your D9 file and update your ndreg.xrg file with
WARNING! : You have to update your game version.
After you have to download 
and change the Server and Login IPs.
Picture : 
Press "Save" button and you'r done!
Step 5
Open 9Disciple and open the shortcut (
)
Credits : Saweet
Edarax