I've not done this through the admin console but the error seems to tell you what is going on - the machine on which you're running the browser to access the admin console must be on the "allowed" list too. If it is all on the same machine it might be 127.0.0.1 or the primary IP address of your machine.
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I’ve looked at a lot of different solutions, and in my humble opinion Aspose is the way to go. Here’s the link: http://aspose.com