Seth Vidal and Michael Stenner did the original development of yum at Duke, while yup was originally developed and maintained by Dan Burcaw, Bryan Stillwell, Stephen Edie, and Troy Bengegerdes of Yellow Dog Linux. The GNU General Public License of yum allows the free and open-source software to be freely distributed and modified without any royalty, if other terms of the license are followed.
(If this is a recurring problem, read this for other possible solutions.)   Try starting Firefox or Sea Monkey in Safe Mode (see the linked article for details).
If you can still ping the servers without any problem, check if your system is behind a proxy.
If you are running Loaded plugins: langpacks, presto, refresh-packagekit Existing lock /var/run/yum.pid: another copy is running as pid 1880.
Another app is currently holding the yum lock; waiting for it to exit...
QEMU has several PCI passthrough techniques, the newest of which is VFIO.
Though yum has a command-line interface, several other tools provide graphical user interfaces to yum functionality.