Issue with yu, updating

[Patrick Topping]

I have not been able to run yum without issues for several weeks.  
Anyone seen this issue before and how to resolve it...???  Thanks in 
advance.

-Patrick

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ptopping at turtle
[/home/ptopping]$ sudo yum update
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
YumRepo Error: All mirror URLs are not using ftp, http[s] or file.
 Eg. /
removing mirrorlist with no valid mirrors: 
//var/cache/yum/fedora/mirrorlist.txt
Error: Cannot find a valid baseurl for repo: fedora