On Mon, 17 Apr 2017, Pat Riehecky wrote: > Scientific Linux 6.9 i386/x86_64 Apr 17, 2017 > > SL 6x users: > Please run yum clean expire-cache That did not work for me, but yum clean metadata did. Sorry, I have lost the original error message, but it was to the effect that the cached metadata was newer than the downloaded metadata and I was using a server or mirror at ftp.scientificlinux.org. > SL Mirrors should consider running a sync at this time.