ssl certificate problems under centos6.3 cause  git clone  /  curl  github resources to fail 
  https://www.v2ex.com/t/434848
 is there any way to upgrade if you don"t want to upgrade? 
 what is given on the Internet is basically upgrading nss-related packages 
  yum update-y nss curl libcurl  
 but I still have no effect here 
						