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If you actually have RedHat, there should be support. If you aren't paying for support, there's a good chance you can't reach their servers.
There are various solutions to the error you mention. First step is usually trying yum clean all
HOWEVER--if you don't have RedHat support, the chances are, as I said, that you won't be able to reach their servers, they do it by subscription.
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yum server configuration
