Reviewing the information from Google Webmaster Tools see that there are duplicate titles when using friendly URLs so we decided to test the module GLOBAL REDIRECT

Once activated, an alias provides a nice clean URL for a route on a site. Drupal however does not remove the old road (eg node/1234). The problem is that now you have two URLs that represent the same content. This is dangerous territory for duplicate pages you can get sandboxed by the search engines

The Global Redirect module is used in combination Pathauto module automatically generates URL aliases / path for various types of content such as nodes, terms of taxonomy and users without the user manually enter a name for each route. For example we have a URL like / category / my-node associated with the path / node/123. The aliases are based on a "pattern" system that uses tokens that the administrator can change.

This does not prevent duplicate content there so we need to take intoaccount using other modules like:

• 301 redirect
• Page title
• With or without WWWs
• Internal Duplicate Page