Hi Mark, Even i have faced the same issue while upgrading my RHEL os from 6.5 to 6.7. A small change you have to make and everything will back on track. You just need to add gpgcheck=0 in your current repo file which is under /etc/yum.repos.d/file.repo , hello , even i have faced the same issue while upgrading from 6.5 to 6.7 i have made only one change i have just eneter gpgcheck=0 in new repo file which is under /etc/yum.repos.d/file.repo. everything seems to be work pretty well for me.
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