Hi,
Try the below method,its working for me.Also make sure that you have mounted the home directory properly.If its not mounted then it will not work.
1. System->Admin->Authentication->Enable NIS support->
NIS domain (Eg: notexample)
Server (server1.example.com)
2.service ypbind restart
chkconfig ypbind on
3.vim /etc/auto.master
# Type the below sentence after /net
/home/guests /etc/auto.home
:wq
4.vim /etc/auto.home
* -rw,intr,soft server1:/home/guests/&
:wq
5.service autofs restart
chkconfig autofs on
6.Now login as guest user which is located under /home/guests
Eg:guest100
su - guest100
guest100>startx -- :2
#2 is the terminal or your station number.The above line will help you login in graphical mode with username as guest100
With Regards,
Puja