== Errores == '''Unhelpful message "undefined method `closed?' for nil:NilClass" when DNS misconfigured''' - ''Solución:'' Aplicar Parche [http://redmine.ruby-lang.org/attachments/download/835] - ''Más información:'' [http://projects.reductivelabs.com/issues/3101] , [http://redmine.ruby-lang.org/issues/show/2708]