have problem because, he dont have in host this line :
127.0.0.1 localhost
127.0.0.1 l2authd.lineage2.com
127.0.0.1 l2testauthd.lineage2.com
if add and again have same problem he must change line on this :
MinProtocolRevision = 1
MaxProtocolRevision = 999
he can find it in gameserver-->config-->server.propeties and tell here if have again problem :)