After restoring the database from the live site to development site, the administrator users fails to log in
When login fails, you shall get the following error message:


  Sorry, unrecognized username or password. Have you forgotten your password?


You say:


  There is no way to login, no error message; simply I am not logged in.


This suggest that the problem is not with the admin passord, but something else (i.e. your restored site is somehow munged).  In that case, you need to start restoring it from scratch.

Resetting the password will not help if the site is munged, but for the record:

There are several ways to reset the Drupal admin password.  Here they are, sorted from the simplest to use to most difficult:


Request a reset password link sent via e-mail (the most used method).
drush upwd admin --password=&lt;new_password&gt; (as already mentioned by develkar).
./scripts/password-hash.sh &lt;new_password&gt; (as you've found out yourself).


Usually, all of these works.  The shell-script method (#3) is very similar to the drush method (#2), but unlike drush, the shell-script method requires you to insert the generated password hash in the database yourself (using phpMyAdmin or similar tool).