Unable use command yum on Redhat 6.3

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http://stackoverflow.com – I have one issue with command yum . I have download redhat 6.3 and install it already. Now I want to use command yum install package but it show message as below : [root@server ~]# yum install bind Loaded plugins: product-id, refresh-packagekit, security, subscription-manager Updating certificate-based repositories. Setting up Install Process Nothing to do (HowTos)