[rhos-list] Can't list "Red Hat Enterprise Linux" channel

[Xu, HongnaX]

Hi
  Why I got nothing when run the command "subscription-manager list -available -proxy=MYPROXY:PORT | grep -A8 "Red Hat Enterprise Linux Server" , so I only subscribe "Red Hat OpenStack - Preview" channel on my machine, which had subscribed both of the channels before been reinstalled, what should I do to subscribe it?

  With only openstack channel subscribed, I can yum search package of openstack-utils, but can't install it, it said:
********************
Loaded plugins: product-id, security, subscription-manager
Updating certificate-based repositories.
Setting up Install Process
Nothing to do
*********************

Best Regards,
Hongna

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