SSH is enabled on the internal interface. You can enable it on the external interface using the web.
Maybe I'm missing something. As far as I can see SSH is enabled on both my NICs. All I want to do is putty or whatever to my inetrnal NIC address and run a command window.
How do I do that?
That is all you do. If it is enabled in the Management Gateway's firewall, then something else between you and the Management Gateway is blocking you.
What happens you try to SSH to the IP Address?