To be able to play on this server you will have to ping this domain:
l2twilight.no-ip.org
Use this website: http://www.net-ok.net/index.php
Now you have my current IP (it changes so this is a temporary solution). I hate my ISP provider
SO!
Just put this IP in your host (for example, one on the pictures: 89.172.193.235 l2authd.lineage2.com).
Then you are able to play on the server with your fully updated interlude client!
P.S. Sry for the guide I made in 5 minutes, I was in a hurry