CORRECT TEXT
Some users home directory is shared from your system. Using showmount -e localhost command,
the shared directory is not shown. Make access the shared users home directory.

Answer:

Explanation:
1. Verify the File whether Shared or not ? : cat /etc/exports
2. Start the nfs service: service nfs start
3. Start the portmap service: service portmap start
4. Make automatically start the nfs service on next reboot: chkconfig nfs on
5. Make automatically start the portmap service on next reboot: chkconfig portmap on

6. Verify either sharing or not: showmount -e localhost
7. Check that default firewall is running on system ? if running flush the iptables using iptables -F
and stop the iptables service.