[Yum] IOError: urlopen error -2 Name.. but yumex works

[Craig Bourne]

The resolution to my problem proved to be un-setting the environment 
variable http_proxy, e.g., issue the following in a bash shell before 
using yum:
  export http_proxy=

I wrote earlier
> I am having the same problem as the previous poster on this subject.
> Debug.txt was created following instructions in replies to that post and
> is attached. In my case this problem surfaced after an update to the
> current stable version of yum. Both yum and yumex worked as expected
> prior to the upgrade.