On 2013.02.05 I installed a SL 6.3/64bit minimal, then after install I tried to install a libreoffice-base package. This has been showed to me:
I tried "yum clean metadata" and "yum clean all" but it didn't worked. The same message appeared to me for 2 days.
Today, 2013.02.07 I didn't do anything else, then tried the "yum clean metadata" then! It worked!
What does this mean that "metadata file does not match checksum"? Does it relates to security? Did someone had a proxy between me and ftp.scientificlinux.org?