Hi, I just did a new install of SL6.4. Yum update is failing with the following... # yum update Loaded plugins: security sl | 3.7 kB 00:00 sl-security | 3.0 kB 00:00 sl-security/primary_db | 3.3 MB 00:00 http://ftp.scientificlinux.org/linux/scientific/6.4/x86_64/updates/security/repodata/primary.sqlite.bz2: [Errno -1] Metadata file does not match checksum Trying other mirror. sl-security/primary_db | 3.8 MB 00:00 http://ftp1.scientificlinux.org/linux/scientific/6.4/x86_64/updates/security/repodata/primary.sqlite.bz2: [Errno -1] Metadata file does not match checksum etc. I did the usual trick of yum clean metadata / yum clean all and it made no difference. I uncommented the mirrorlist in /etc/yum.repos.d/sl.repo and tried again. It goes through all of them....here are some highlights... Trying other mirror. http://mirror.aarnet.edu.au/pub/scientific/6.4/x86_64/updates/security/repodata/primary.sqlite.bz2: [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 416 Unknown" Trying other mirror. ftp://mirror.aarnet.edu.au/pub/scientific/6.4/x86_64/updates/security/repodata/primary.sqlite.bz2: [Errno 14] PYCURL ERROR 36 - "Offset (8016072) was beyond file size (4008036)" Trying other mirror. http://ftp.halifax.rwth-aachen.de/scientificlinux/6.4/x86_64/updates/security/repodata/primary.sqlite.bz2: [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 416 Unknown" Trying other mirror. ftp://ftp.halifax.rwth-aachen.de/scientificlinux/6.4/x86_64/updates/security/repodata/primary.sqlite.bz2: [Errno 14] PYCURL ERROR 36 - "Offset (8016072) was beyond file size (4008036)" Trying other mirror. http://gd.tuwien.ac.at/opsys/linux/scientific/6.4/x86_64/updates/security/repodata/primary.sqlite.bz2: [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 416 Unknown" Trying other mirror. ftp://gd.tuwien.ac.at/opsys/linux/scientific/6.4/x86_64/updates/security/repodata/primary.sqlite.bz2: [Errno 14] PYCURL ERROR 36 - "Offset (8016072) was beyond file size (4008036)" Trying other mirror. http://mirror.cpsc.ucalgary.ca/mirror/scientificlinux.org/6.4/x86_64/updates/security/repodata/primary.sqlite.bz2: [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 416 Unknown" Trying other mirror. ftp://mirror.cpsc.ucalgary.ca/mirror/scientificlinux.org/6.4/x86_64/updates/security/repodata/primary.sqlite.bz2: [Errno 14] PYCURL ERROR 36 - "Offset (8016072) was beyond file size (4008036)" It went through the whole list and failed on them all. The only way to get yum to work is to disable the sl-security repo. I take it there is a problem with primary.sqlite.bz2 for this repo ? If not...how can I fix this problem ? Cheers, Emyr