I tried to follow the directions of the https://www.scientificlinux.org/documentation/howto/upgrade for upgrading to SL 4.1 from 4, however rpm fails for both statements (4.x and 41): [root@chrome ~]# rpm -Uvh ftp://ftp.scientificlinux.org/linux/scientific/4x/i386/misc/RPMS/yum-conf-4x.SL.noarch.rpm Retrieving ftp://ftp.scientificlinux.org/linux/scientific/4x/i386/misc/RPMS/yum-conf-4x.SL.noarch.rpm error: skipping ftp://ftp.scientificlinux.org/linux/scientific/4x/i386/misc/RPMS/yum-conf-4x.SL.noarch.rpm - transfer failed - Unknown or unexpected error [root@chrome ~]# rpm -Uvh ftp://ftp.scientificlinux.org/linux/scientific/41/i386/misc/RPMS/yum-conf-4x.SL.noarch.rpm Retrieving ftp://ftp.scientificlinux.org/linux/scientific/41/i386/misc/RPMS/yum-conf-4x.SL.noarch.rpm error: skipping ftp://ftp.scientificlinux.org/linux/scientific/41/i386/misc/RPMS/yum-conf-4x.SL.noarch.rpm - transfer failed - Unknown or unexpected error [root@chrome ~]# Any ideas on how to safely upgrade?