Notification Server 6.0.6074
Inventory Solution 6.1
Notification Server is configured for SSL using port 443 as it resides in the DMZ and is there to manage remote users only. The Default Web site was named in IIS, and the Notification Server was installed via a command line as per the Notification Server documentation. SSL certificate is installed and its Internet name is entered into the CoreSettings.config file via the PreferredNSHost parameter.
Although IIS had a SSL certificate installed, and that the Notification Server's clients were configured to communicate to the Notification Server via HTTPS, IIS was not actually forced into using SSL only, which is why when a client requested package information via HTTPS, then Notification Server returned a HTTP URL in its Package.xml file, thus causing the Notification Server Agent to use HTTP for the GetPackageSnapshot request.
In order to force IIS to use SSL, the following change was made:
This operation allows the Notification Server to provide a HTTPS URL for the Notification Server Agent to use for its GetPackageSnapshot request, which caused the package download to be successful.