yum check-update failed

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Hi There, when I try to run yum check-update, it seems failed. but I don't know why? I can ping www.redhat.com, so the network is fine, and I didn't change any user name/password for subscription ID or anything else...Is it because my subscription expired?

#yum check-update
Loaded plugins: product-id, refresh-packagekit, security, subscription-manager
Repo rhel-scalefs-for-rhel-6-server-rpms forced skip_if_unavailable=True due to: /etc/pki/entitlement/xxxxxxxx-key.pem
Repo rhel-ha-for-rhel-6-server-rpms forced skip_if_unavailable=True due to: /etc/pki/entitlement/xxxxxxxx-key.pem
Repo rhel-6-server-rpms forced skip_if_unavailable=True due to: /etc/pki/entitlement/xxxxxxxx-key.pem
Repo rhel-6-server-optional-rpms forced skip_if_unavailable=True due to: /etc/pki/entitlement/xxxxxxxx-key.pem
https://cdn.redhat.com/content/dist/rhel/server/6/6Server/x86_64/optional/os/repodata/repomd.xml: [Errno 14] PYCURL ERROR 22 - "HTTP response code said error"
Trying other mirror.
https://cdn.redhat.com/content/dist/rhel/server/6/6Server/x86_64/os/repodata/repomd.xml: [Errno 14] PYCURL ERROR 22 - "HTTP response code said error"
Trying other mirror.
https://cdn.redhat.com/content/dist/rhel/server/6/6Server/x86_64/highavailability/os/repodata/repomd.xml: [Errno 14] PYCURL ERROR 22 - "HTTP response code said error"
Trying other mirror.
https://cdn.redhat.com/content/dist/rhel/server/6/6Server/x86_64/scalablefilesystem/os/repodata/repomd.xml: [Errno 14] PYCURL ERROR 22 - "HTTP response code said error"
Trying other mirror.
ML

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