php mysql_connect():使用旧(4.1.1之前)身份验证协议的连接被拒绝

so i'm using ispconfig 3.0.5.4p8 to host some online game website and the online game server is using mysql 4.0 the database is on a remote machine the website i'm using right now is connecting to the database with mysql_connect when i'm opening the website it says

Warning: mysql_connect(): Connection using old (pre-4.1.1) authentication protocol refused (client option 'secure_auth' enabled) in /var/www/clients/client0/web4/web/class/shop_func.php on line 11 Can't connect to db

i can't change the mysql database because the game server doesn't support newer mysql server

the search result on google is nothing pointing to my problem.. most of them is just saying because the mysql client is too old..infact what i think i'm dealing right now is the mysql is too old..

the ispconfig php version is 5.3.29 the mysql version is 4.0 portable