Actually, In this case Client failed to connect to NIS server:
U have to started 3 services on NIS server
1. service portmap restart
2. service ypserverd restart { I haven't remember its ypserverd or ypserver, plz check}
3. service yppasswdd restart
4. service ypbind restart
And start these service after giving NISSERVER and corresponding Nis domain name on client end using authconfig command
1. service portmap restart
2. service yppasswdd restart
3. service ypbind restart
I thk It will work after this.
Gaurav