Error
[root@localhost ~]# yum update
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
YumRepo Error: All mirror URLs are not using ftp, http[s] or file.
Eg. </html>/
removing mirrorlist with no valid mirrors: /var/cache/yum/i386/6/base/mirrorlist.txt Error: Cannot find a valid baseurl for repo: base
Fix
Be sure that you can ping vault.centos.org
Then edit /etc/yum.repos.d/CentOS-Base.repo
Comment out mirrorlist and uncomment baseurl
Change all
baseurl=http://mirror.centos.org/centos/$releasever/centosplus/$basearch/
to
baseurl=http://mirror.nsc.liu.se/centos-store/6.10/os/$basearch/
yum clean all
yum update -y
Enjoy!!!!