The following instructions are what should be reviewed in regards to your issue:
Use a text editor to open the [install-dir]/conf/[application]/Application.xml file for your HTTP origin application and add the following property to the / container. Be sure to add the property to the correct container in Application.xml as there are several such containers in the file.
Adding this Property to the [Wowza-Install]/conf/Application.xml (where it’s currently added) will only be used when an application is created that doesn’t have it’s own Application.xml file.
Can you verify that you have this property added in the / container?