title: OpenSSL::SSL::SSLError while installing gems
body: <p>The gem seems failing to install any gem on my Linux, I'm not sure what's cause of the problem.
  Below is the debug message while installing mongo gem, it gets plenty of repeated "OpenSSL::SSL::SSLError" error messages, any idea what might be wrong?</p>
  
  <pre><code>$ gem install --debug mongo 
  </code></pre>
  
  <hr>
  
  <pre><code>Exception `Gem::LoadError' at /home/user/.rvm/rubies/ruby-2.0.0-p0/lib/ruby/site_ruby/2.0.0/rubygems/dependency.rb:296 - Could not find 'rdoc' (&gt;= 0) among 8 total gem(s)
  Exception `Errno::EEXIST' at /home/user/.rvm/rubies/ruby-2.0.0-p0/lib/ruby/2.0.0/fileutils.rb:323 - File exists - /home/user/.gem/specs/rubygems.org%443
  Exception `OpenSSL::SSL::SSLError' at /home/user/.rvm/rubies/ruby-2.0.0-p0/lib/ruby/2.0.0/openssl/buffering.rb:174 - read would block
  Exception `OpenSSL::SSL::SSLError' at /home/user/.rvm/rubies/ruby-2.0.0-p0/lib/ruby/2.0.0/openssl/buffering.rb:174 - read would block
  </code></pre>