I have CentOS 6.6 running on VirtualBox w/ NAT.  I am behind a proxy and have configured my proxy settings; the virtual machine is talking just fine to the internet.When I attempt to install anything via yum, or do a yum update, I receive the following error:# yum updateLoaded plugins: fastestmirror, refresh-packagekit, securitySetting up Update ProcessDetermining fastest mirrorsepel/metalink                  | 6.0 kB 00:00 * epel: dl.fedoraproject.org * extras: linux.cc.lehigh.edu * updates: centos.sonn.combase                           | 3.7 kB 00:00base/primary_db                | 4.6 MB 00:00file:///var/ftp/pub/repos/OS/CentOS/6.6/x86_64/os/repodata/repomd.xml: [Errno 14] Could not open/read file:///var/ftp/pub/repos/OS/CentOS/6.6/x86_64/os/repodata/repomd.xmlTrying other mirror.Error: Cannot retrieve repository metadata (repomd.xml) for repository: centos-base.  Please verify its path and try again The path in /var/ftp/... didn't exist, so I created it but the only change is that the error switches from being a file access error to an error saying that the repomd.xml file is damaged.  If I try to yum install <package> where I --disablerepo=<every repo except epel>, it succeeds.Anybody have an idea of what's happening here?
yum update on CentOS 6.6 fails
centos;yum