[Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404 Not Found"

Hi,

I am going to upgrade my Redhat workstation from rhel 6.4 (beta) to rhel 6.8 but facind the same issue repetadely. I tried almost everything to resolve this issue but getting the same thing everytime.

Below are the complete error and yes I am using a redhat-subscription and the system is on internet without having any firewall blockage.

yum update
Loaded plugins: product-id, refresh-packagekit, rhnplugin, security, subscription-manager
This system is receiving updates from Red Hat Subscription Management.
This system is not registered with RHN Classic or RHN Satellite.
You can use rhn_register to register.
RHN Satellite or RHN Classic support will be disabled.
https://cdn.redhat.com/content/dist/rhel/workstation/6/%24releasever/x86_64/os/repodata/repomd.xml: [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404 Not Found"
Trying other mirror.
Error: Cannot retrieve repository metadata (repomd.xml) for repository: rhel-6-workstation-rpms. Please verify its path and try again

Let me know, how can i avoide that.

Thanks in Advance !