Q:

With Nokogiri i am getting error "initialize': getaddrinfo: No such host is known. ( SocketError)"

I worte the below code, just to start the Nokogiri to mee the requirement and when I ran it for testing got the error:
D:\WIPData\Ruby\Scripts>Nokogiri.rb
C:/Ruby193/lib/ruby/1.9.1/net/http.rb:762:in `initialize': getaddrinfo: No such
host is known.   (SocketError)
        from C:/Ruby193/lib/ruby/1.9.1/net/http.rb:762:in `open'
        from C:/Ruby193/lib/ruby/1.9.1/net/http.rb:762:in `block in connect'
        from C:/Ruby193/lib/ruby/1.9.1/timeout.rb:54:in `timeout'
        from C:/Ruby193/lib/ruby/1.9.1/timeout.rb:99:in `timeout'
        from C:/Ruby193/lib/ruby/1.9.1/net/http.rb:762:in `connect'
        from C:/Ruby193/lib/ruby/1.9.1/net/http.rb:755:in `do_start'
        from C:/Ruby193/lib/ruby/1.9.1/net/http.rb:744:in `start'
        from C:/Ruby193/lib/ruby/1.9.1/open-uri.rb:306:in `open_http'
        from C:/Ruby193/lib/ruby/1.9.1/open-uri.rb:775:in `buffer_open'
        from C:/Ruby193/lib/ruby/1.9.1/open-uri.rb:203:in `block in open_loop'
        from C:/Ruby193/lib/ruby/1.9.1/open-uri.rb:201:in `catch'
        from C:/Ruby193/lib/ruby/1.9.1/open-uri.rb:201:in `open_loop'
        from C:/Ruby193/lib/ruby/1.9.1/open-uri.rb:146:in `open_uri'
        from C:/Ruby193/lib/ruby/1.9.1/open-uri.rb:677:in `open'
        from C:/Ruby193/lib/ruby/1.9.1/open-uri.rb:33:in `open'
        from D:/WIPData/Ruby/Scripts/Nokogiri.rb:6:in `<main>'

D:\WIPData\Ruby\Scripts>

CODE
require 'nokogiri'
require 'open-uri'

# Get a Nokogiri::HTML::Document for the page we’re interested in...

doc = Nokogiri::HTML(open('http://www.google.co.in'))

Why so and how to fix the same,please advice me. 

A:

It appears you need to configure a proxy.  Find out what the proxy URL/Port is for your organization (and whether there needs to be authentication).  You may be able to view this information from your browser configuration.  In order to use it with your Ruby code, you need to set the HTTP_PROXY environment variable. 
You can set it in Ruby code:
ENV['HTTP_PROXY'] = 'http://hostname:port'

or if you need authentication:
ENV['HTTP_PROXY'] = 'http://username:password@hostname:port'

A more permanent solution is to set HTTP_PROXY in your system environment variables.