php-mysql connection fails with the error "Can't connect to MySQL server on 'example.com' (13)"

Solution Verified - Updated -

Issue

  • Unable to make connections to mysql databases through apache/php. Same connection from CLI ( Command line Interface) works.

  • php connection to  mysql server fails with the following message :

    Can't connect to MySQL server on 'example.com' (13)

Environment

  • Red Hat Enterprise Linux 5
  • php- 5.3.2-6.el6_0.1
  • mysql-5.1.52-1.el6_0.1 

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