Wrapper don't works in different domains

I have installed joomla in a domain and moodle in another. The system health is all green. I can see courses in Joomla and Hikashop works fine with the courses.

But if I try to open moodle in Joomla with the wrapper I get a blank space. Checking the page source code I found:

So the code is there but simply can't open the frame source.

Autoheight is OFF, height and width are both blank to avoid js restrictions.

I tried also to open moodle in a new window and in the same. All 3 options failed. If I try to open the link www.xxx.com/?a=1 in Firebug it works fine, so the link is right.

Any idea?

Thanks in advance

Did you allow frame embedding in Moodle?

Well done for figuring it out. I didn't check it before. Now it works fine.

Thanks Antonio.