title: Could not find a valid gem 'rails' (>= 0) in any repository
body: <p>I'm on a fresh mac and just installed ruby 1.9.3 using rvm. Now I'm trying to install rails and getting the error on the title of this post. I'll post below all info I have from the command line to see if anyone can help me out here!! </p>
  
  <pre><code>Leonardos-MacBook-Air:~ leo$ gem install rails
  WARNING:  Error fetching data: SocketError: getaddrinfo: nodename nor servname provided, or not known (http://rubygems.org/latest_specs.4.8.gz)
  ERROR:  Could not find a valid gem 'rails' (&gt;= 0) in any repository
  ERROR:  Possible alternatives: rails
  Leonardos-MacBook-Air:~ leo$ ping rubygems.org
  PING rubygems.org (204.232.149.25): 56 data bytes
  64 bytes from 204.232.149.25: icmp_seq=0 ttl=47 time=104.399 ms
  64 bytes from 204.232.149.25: icmp_seq=1 ttl=47 time=105.760 ms
  ^C
  --- rubygems.org ping statistics ---
  2 packets transmitted, 2 packets received, 0.0% packet loss
  round-trip min/avg/max/stddev = 104.399/105.079/105.760/0.681 ms
  Leonardos-MacBook-Air:~ leo$ gem env
  RubyGems Environment:
    - RUBYGEMS VERSION: 1.8.23
    - RUBY VERSION: 1.9.3 (2012-04-20 patchlevel 194) [x86_64-darwin11.4.0]
    - INSTALLATION DIRECTORY: /Users/leo/.rvm/gems/ruby-1.9.3-p194
    - RUBY EXECUTABLE: /Users/leo/.rvm/rubies/ruby-1.9.3-p194/bin/ruby
    - EXECUTABLE DIRECTORY: /Users/leo/.rvm/gems/ruby-1.9.3-p194/bin
    - RUBYGEMS PLATFORMS:
      - ruby
      - x86_64-darwin-11
    - GEM PATHS:
       - /Users/leo/.rvm/gems/ruby-1.9.3-p194
       - /Users/leo/.rvm/gems/ruby-1.9.3-p194@global
    - GEM CONFIGURATION:
       - :update_sources =&gt; true
       - :verbose =&gt; true
       - :benchmark =&gt; false
       - :backtrace =&gt; false
       - :bulk_threshold =&gt; 1000
    - REMOTE SOURCES:
       - http://rubygems.org/
  Leonardos-MacBook-Air:~ leo$ ruby --version
  ruby 1.9.3p194 (2012-04-20 revision 35410) [x86_64-darwin11.4.0]
  Leonardos-MacBook-Air:~ leo$ 
  </code></pre>