Hello everyone, I solved my problem.
Here is what we did:
Made sure there was a DNS entry for the IP assigned to our DNN root install in IIS, and updated the Portal Alias in the DB to that domain.
Then , VERY IMPORTANT.
I had just completed the 5.6.1 upgrade prior to attempting to move the site. Part of the upgrade instructions included set the value of this key to false:
so you could perform a manual upgrade.
I had then moved the files over to the production location and left the value false, after reading a post that said this value MUST be true, I changed it and my site appeared and 'This site is currently unavailable' message went away.
Hope this helps some other newbie out there...