Getting error “getaddrinfo: No such host is known. (Socke tError)” with mechanize gem

问题

I tried the below code:

require 'mechanize'

agent = Mechanize.new{|a| a.ssl_version, a.verify_mode = 'SSLv3', OpenSSL::SSL::VERIFY_NONE}
    page = agent.get "https://gegsltraining.aravo.com/"
page=page.link_with(:dom_class => "button").click()

But my bad getting the below error.

D:\WIPData\Ruby\Scripts>mechanize_dowload.rb
C:/Ruby193/lib/ruby/gems/1.9.1/gems/net-http-persistent-2.8/lib/net/http/persist
ent/ssl_reuse.rb:29:in `initialize': getaddrinfo: No such host is known.  (Socke
tError)
        from C:/Ruby193/lib/ruby/gems/1.9.1/gems/net-http-persistent-2.8/lib/net
/http/persistent/ssl_reuse.rb:29:in `open'
        from C:/Ruby193/lib/ruby/gems/1.9.1/gems/net-http-persistent-2.8/lib/net
/http/persistent/ssl_reuse.rb:29: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/gems/1.9.1/gems/net-http-persistent-2.8/lib/net
/http/persistent/ssl_reuse.rb:29: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:750:in `start'
        from C:/Ruby193/lib/ruby/gems/1.9.1/gems/net-http-persistent-2.8/lib/net
/http/persistent.rb:628:in `start'
        from C:/Ruby193/lib/ruby/gems/1.9.1/gems/net-http-persistent-2.8/lib/net
/http/persistent.rb:570:in `connection_for'
        from C:/Ruby193/lib/ruby/gems/1.9.1/gems/net-http-persistent-2.8/lib/net
/http/persistent.rb:926:in `request'
        from C:/Ruby193/lib/ruby/gems/1.9.1/gems/mechanize-2.5.1/lib/mechanize/h
ttp/agent.rb:258:in `fetch'
        from C:/Ruby193/lib/ruby/gems/1.9.1/gems/mechanize-2.5.1/lib/mechanize.r
b:407:in `get'
        from D:/WIPData/Ruby/Scripts/mechanize_dowload.rb:5:in `<main>'

D:\WIPData\Ruby\Scripts>

The same script ran perfectly on my personal machine,but not in my company.

Could you please me to fix the same?

Thanks in advance