When i run :
yum update
I get :

Failed to set locale, defaulting to C
Loaded plugins: fastestmirror, replace
Setting up Update Process
Loading mirror speeds from cached hostfile
epel/metalink | 5.2 kB 00:00

Could not retrieve mirrorlist https://mirror.webtatic.com/yum/el6/x86_64/mirrorlist error was
14: PYCURL ERROR 7 - “Failed to connect to 2400:6180:0:d0::9:b001: Network is unreachable”
Error: Cannot find a valid baseurl for repo: webtatic

How to fix this :(