What is the current UPS shipping gateway? (outage 2019-01-06)

You simply need to update the UPS Gateway URL to use "https"

To change this setting, login to the backend of your Magento website and then go to :

  1. System > Configuration
  2. Click “Shipping Methods”
  3. Click the tab for “UPS”
  4. Find the “Gateway URL” setting and change the url from “http://www.ups.com/using/services/rave/qcostcgi.cgi” to “https://www.ups.com/using/services/rave/qcostcgi.cgi”.

I put together a quick video on how to fix it here: https://www.youtube.com/watch?v=VNHQb3X7Lys&feature=youtu.be