1. Check your WiFi/Network
  2. Restart your browser and try again or try in a different browser (Firefox, Chrome, Safari).
  3. Restart your router and WiFi.
  4. If it still does not work navigate to https://83.221.131.66 (instead of https://keeptrack.dk) and allow the connection. If that does not work you most likely have a network failure i.e. your Internet Service Provider is down. Try navigating to other websites to check your connection.

This error is often caused by a problem with the (ISP's) DNS-server (that is the server translating addresses from human readable addresses to machine addresses so you do not have to remember '83.221.131.66', but only 'keeptrack.dk').

If this DNS problem is recurring you might be able to switch to a different DNS server like one of these that are stable and open for everybody to use:

  • OpenDNS 208.67.222.222 or 208.67.220.220
  • Google 8.8.8.8