XF 1.1 Access denied..index.php

[Claudio]

When I try to access to my forum I get the message "Access denied."..the source code of the page has only a "access denied" text and nothing else..

Which is the problem? I have no .htaccess file so I don´t know what is causing this :S

 

[Digital Doctor]

..

Site looks back up and running.
What was the issue ?