sometimes its your server's fault, because that is the kasha malaga protection.
and if you are not connecting to the kasha's auth server (or smthng like that) of your server, u may get this message.
try again or/and check with ur clanmates if they have similar problems
if you have the right buffs i might say dino because you get a lot of mobs easily and a lot of adena. but mos is good too
now if u are talking about a walker farming zone..well it depends on how good/bad is ur equip. and what toons do u have to bot