While install IEEL 2.3 (Intel Lustre) on a Redhat 6.6 machine, install script fails with :

DEBUG Failed to read information for repository rhel-x86_64-server-6.6.z.
INFO Yum does not seem to be able to find required network resources. Please check your network and yum configuration and try again. Perhaps you need to disable some repositories that are not reachable.
[26/Aug/2015:17:18:18] INFO URLs that failed: https://xmlrpc.rhn.redhat.com/rpc/api

yum repolist

Loaded plugins: product-id, rhnplugin, security, subscription-manager
This system is receiving updates from RHN Classic or RHN Satellite.
repo id repo name status
rhel-6-server-eus-rpms Red Hat Enterprise Linux 6 Server - Extended Update Support (RPMs) 16,025+12
rhel-6-server-rpms Red Hat Enterprise Linux 6 Server (RPMs) 16,048+12
rhel-ha-for-rhel-6-server-eus-rpms Red Hat Enterprise Linux High Availability (for RHEL 6 Server) - Extende 514
rhel-ha-for-rhel-6-server-rpms Red Hat Enterprise Linux High Availability (for RHEL 6 Server) (RPMs) 479
rhel-hpn-for-rhel-6-server-rpms Red Hat Enterprise Linux High Performance Networking (for RHEL 6 Server) 54
rhel-lb-for-rhel-6-server-eus-rpms Red Hat Enterprise Linux Load Balancer (for RHEL 6 Server) - Extended Up 50
rhel-lb-for-rhel-6-server-rpms Red Hat Enterprise Linux Load Balancer (for RHEL 6 Server) (RPMs) 20
rhel-rs-for-rhel-6-server-eus-rpms Red Hat Enterprise Linux Resilient Storage (for RHEL 6 Server) - Extende 555
rhel-rs-for-rhel-6-server-rpms Red Hat Enterprise Linux Resilient Storage (for RHEL 6 Server) (RPMs) 557
rhel-scalefs-for-rhel-6-server-rpms Red Hat Enterprise Linux Scalable File System (for RHEL 6 Server) (RPMs) 46
rhel-server-dts-6-eus-rpms Red Hat Developer Toolset for RHEL 6 Server EUS (RPMs) 84
rhel-server-dts-6-rpms Red Hat Developer Toolset RPMs for Red Hat Enterprise Linux 6 Server 84
rhel-server-dts2-6-eus-rpms Red Hat Developer Toolset 2 for RHEL 6 Server EUS (RPMs) 469
rhel-server-dts2-6-rpms Red Hat Developer Toolset 2 RPMs for Red Hat Enterprise Linux 6 Server 469
rhel-sfs-for-rhel-6-server-eus-rpms Red Hat Enterprise Linux Scalable File System (for RHEL 6 Server) - Exte 46
rhel-x86_64-server-6.6.z RHEL EUS Server (v. 6.6.z for 64-bit x86_64) 15,035+12
repolist: 50,535

Please help me out. Thanks