https://smokiespermits.nps.gov/index.cfm is up and running. It went online sometime between 6 AM and 9 AM EST
I made a reservation and got my order number. When I entered my order number on the page https://smokiespermits.nps.gov/gsmbctransactions.cfm I received and error, "Your transaction information could not be found"
I called the backcountry office (865)436-1297 and Ranger James W emailed me the PDF Reservation form.