I think I have, with your help, solved the problem.
I have put all the .bikey on my server in the main 'Keys' folder.
I say 'think' because I can't check if it works, when I want to connect to my server, I receive the message "You have been banned". WTF ?!
I hope it's not my CD key which has been banned...
I have tried to connected many times to my server, it may cause the message. Isn't it ?
On my server I have the file ban.txt containing a number : "756678".
I delete the file ? What am I suppose to do ?
EDIT : I have solved the problem with the ban...
EDIT 2 : My first problem is solved. Indeed, all the .bikey have to be in the main directory 'KEYS'.