TOPIC: return url succes.php gives 404

Hi,

Setup DTReg, Put iDeal rabo on test mode.
After paying for an event, with iDeal, I click return to shop.
I land on this page 404 page:
http://apf-theater.webfruitdesign.com/c ... sk=restore

and get a 404: The requested URL /components/com_dtregister/index.php/nl/success.php was not found on this server.

So no emails are sent, no records are made.
Permission are 755 for folders and 644 for all files
Joomla 3.2.1
Dtreg: 3.0.6a

I would like to test the whole process, including email and record creation is there a way to do this?
Regards,
Willem-Hein