You can see there are some resent issues due to update of ca-bundle files. So in Centos 4 servers the common ca-bundle files located on  /usr/share/ssl/certs doesn’t work with curl SSL . cPanel also on END of life for Centos 4 version .  cPanel stopped the Centos support in September 2012. So The best solution is to upgrade  your OS  to the latest version.

In mean time there is a work  around  for the issue. To fix the curl-SSL issue , please do the following.

 # mv    /usr/share/ssl/certs   /usr/share/ssl/certs.orig/
 # mkdir /usr/share/ssl/certs

Now copy  all files  from a Centos 6.x server  from the folder  /etc/pki/tls/certs/   to your centos 4 server folder /usr/share/ssl/certs/

This  is only a temporary fix. Please see the different locations of your ca-bundle folder in  the following OS .

centos 4.x   => /usr/share/ssl/certs/

Centos 5.x => /etc/pki/tls/certs/

Centos 6.x => /etc/pki/tls/certs/