Can not install the package group 'Network Infrastructure Server' using `yum groupinstall` command

Issue

• Not able to install the Package group Network Infrastructure Server in Red Hat Enterprise Linux 6.3 using yum groupinstall command
• Getting following message while installing the same.

# yum groupinstall  "Network Infrastructure Server"
Loaded plugins: product-id, security, subscription-manager
Updating certificate-based repositories.
Setting up Group Process
Warning: Group network-server does not have any packages.
No packages in any requested group available to install or update

• The following packages are available in the group Network Infrastructure Server

# yum groupinfo "Network Infrastructure Server"
Loaded plugins: product-id, security, subscription-manager
Updating certificate-based repositories.
Setting up Group Process

Group: Network Infrastructure Server
 Description: Servers for core network protocols and services, such as DHCP or DNS.
 Optional Packages:
   bind
   bind-chroot
   bind-dyndb-ldap
   dhcp
   dnsmasq
   freeradius
   quagga
   radvd
   rsyslog-gnutls
   rsyslog-gssapi
   rsyslog-mysql
   rsyslog-pgsql
   rsyslog-relp
   syslinux
   tftp-server