Moodle sends empty message to joomdle

Sorry for my bad English, but I'm using google translator ( www.google.com.br/language_tools )

Hi, I accompanied a tutorial in Portuguese that teaches step by step to integrate Joomla with Moodle using Joomdle.
What is the problem?
Following all the steps, everything worked perfectly, integrating joomla and moodle joomdle joomdle, but when I finish and I joomdle joomla system to verify the Joomdle Web Service appears with an X and the error description is "Response received empty Moodle"

Follow the tutorial link
1fish.info/pt/CMS/Joomla/Aprenda-a-integrar-o-Joomla-ao-Moodle

Hi there,

This tutorial is not written by us, so it is not fair for us to comment on this tutorial. Perhaps you can ask the authors directly on specifics related to the tutorial.

Which version of Joomla are you using? Moodle? Joomdle?

The error message you get, is normally to do with the URL configuration. See the system health check here
www.joomdle.com/wiki/System_health_check