cant connect to server .

i can choose server from server list .. but i cant connect to server ,
it say '' fail to connect to game sever !!! ''
any solution ?
BTW i need to know which IP adress should i use to edit the game.exe .
the "127.0.0.1 or my IP adress" ??

thanks in advance

You need ohter ps_xxxxx.exe files.You recieve that error because they don't match with your dbs.