When you run a yum command like: yum install vim You may get the following error: Loaded plugins: fastestmirror http://repo.dimenoc.com/pub/centos/7.1.1503/os/x86_64/repodata/repomd.xml: [Errno 14] HTTP Error 404 – Not Found Trying other mirror. Is this ok [y/d/N]: y Downloading packages: Delta RPMs disabled because /usr/bin/applydeltarpm not installed. vim-enhanced-7.4.160-1.el7.x86 FAILED http://ftp.linux.ncsu.edu/pub/CentOS/7.1.1503/os/x86_64/Packages/vim-enhanced-7.4.160-1.el7.x86_64.rpm: [Errno 14] HTTP Error 404 – Not Found To fix the error: yum clean all yum update Now try again: yum install vim The command should continue normally.