When I click in a Question or Answer, the system show 404 not found error

When I click in a Question or Answer, the system show 404 not found error.

The site permalink is default: http://debug.sinax.com.br/?p=123
And the ANSPRESS permaling is:

lucasbosco Answered question

It look like mod_rewrite is not enabled in your server. Its required for pretty permalinks.