Moodle configuration with Connect

I can not finished configuration, the screen error is:

common-info API call returned an empty document. Please check your settings and try again

In my configuration are:

Host: meetXXXXXXXX.adobeconnect.com/primero/api/xml

Meeting domain: meetXXXXXXXX.adobeconnect.com

Port: 80

admin logoi: (my email address)

admin pass: (provided by Adobe)

HTTP Authentication Header: my-user-id

What´s wrong?

Thanks in advanced

Raúl