You're probably located behind a proxy server. Edit /etc/yum.conf and add some proxy info and the next time you run the command it'll function okay.  Also a good idea to now update openssl, with the heartbleed bug and all...
Did anyone started using insightIQ version 3.0 and like to share their feedback? I'm planning on upgrading 2.5.1 to 3.0 in few weeks and like to know if there are any glitches with new version.  thanks in advance. -H
InsightIQ 3.0