Checkout error: the page is redirected in a way...

Checkout error: the page is redirected in a way that never ends (Although, cookies are active). I have this error on Firefox when I try to checkout. In IE the page is reloading to infinite.

My system (local instalation): PHP 5.3.1, Joomla 1.6.0, HikaShop 1.4.3. Firefox is 3.6.13, IE 8. I installed HikaShop on a new Joomla website, I added just 2 products. Native Joomla SEO is active, including mod_rewrite (I tried to disable it, same problem).
Any ideas?

Thanks.

Do you have SSL activated on the checkout ? There is a known issue with joomla 1.6 for current version when you have HTTPS forced on the checkout.
You need to replace the code:
$ssl= true;

by:
$ssl=1;

in the file components/com_hikashop/controllers/checkout.php

To fix it, supposing that it comes from that.

SSL was active indeed. I made the change, now it works. Thanks!