Myopenhab show "online" but fails to load demo

I’m a newbie to openHAB and trying to connect using my.openhab.

  • Added the jar
  • added myopenhab.persist
  • Changed config setting as detailed on the site
  • copied secret and uuid to my.openHAB account
  • … restarted…

The site show my instance as “ONLINE” but when I navigate to I get “openHAB offline”