[Terry B]

Originally Posted by DJDD

I get the same error message.

The link in your post redirects to:
www.teleskop-express.de/shop/product_info.php/language/en/info/p641_Off-Axis-Guider---nur-9mm-Baulaenge---T2-Anschluss---fuer-CCD.html
with http:// in the front, of course.

even the base URL:
http://www.teleskop-express.de
gives the error

Interesting. All of your links work for me. It's a store in Germany. I connect with bigpond at work and at home and both worked. Maybe some ISPs block the site?
Here is a pic at least of the guider.