Orbit Downloader is attacking 118.69.172.112 ( Vitenam ) & 118.69.172.247 ( Vitenam )with millions of SYN packages with a faked sender address (spoofed DDoS).
For more :
http://forum.orbitdownloader.com/viewtopic.php?id=96993
http://www.heise.de/newsticker/meldung/Warnung-vor-Orbit-Downloader-1923667.html
NEVER USE ORBIT DOWNLOADER!!