allowing a single connection in server

[thakur]

Hi All,

I want my Linux system to authenticate a single user and warning 
and disconnecting the second connection if any other with the 
same username wants to connect to the server. I did the following 
in /etc/security file in Linux Red Hat 5.2 system.

*       -       maxlogins               1

But it did not work. Is there more to do with this or any other way 
to control the access?

I need your help.

Regards,
Thakur Gyawali