[CentOS] restricting access to an NIS netgroup

I am using CentOS 5.7. I have an /etc/security/access.conf file which has the following:

+ : root : LOCAL + : @mynetgroup : ALL - : ALL : ALL

I thought this is supposed to restrict access to the system to only root and the accounts in the mynetgroup netgroup; however, anyone NIS account is still able to login. It appears that the access.conf is being ignored completely, so I'm thinking there's something I'm missing.

How can I restrict access to a system based on NIS netgroups?

Thanks!

--- Mike VanHorn Senior Computer Systems Administrator College of Engineering and Computer Science Wright State University 265 Russ Engineering Center 937-775-5157 michael.vanhorn@wright.edu http://www.engineering.wright.edu/~mvanhorn/