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well i have the same problem.. i used to have a firewall but i unisntall and the problem continues.. y checked the user.php and all, i turned on all the debugs and nothing... maybe is my user's isp, because sometimes only the ones with the same isp fail to login, but.. is something to do? they tell me they are able to login, no problems, on other XOOPS sites, they have no firewall active.. so i dont know... register is ok, once loged they dont get kicked out, y cleaned the MySQL tables too...
www.viciopolis.tk if anyone wants to check...