Hi!
I have just set the whole survey, generated the tokens and sent the e-mails inviting them to answer. But, when they try to open the survey, it shows error 403 and the following message:

Forbidden
You don't have permission to access /pesquisa/index.php on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

Please, if anyone can help me I would be really glad.

By the way, before I post this message I have searched for similar problems. A topic I found said this could be a htaccess problem, and I already tried to both change de CHMOD of them to 777 and even delete it. And it just didn't work.

Chek if there is another .htaccess file in your web root. Try renaming that one if exists and see if the problem goes aways in LimeSurvey.

I just tried. Still didn't work.
But thanks for trying. I'm running out ideas.