I have a static public website I've hosted for years and it is running under IIS 10. Late this afternoon it started returning a "HTTP Error 503. The service is unavailable."
Restarted it, no change. Deleted/redefined the site in IIS, same thing. Tried enabling failed request tracing and nothing is showing up.
If I define an 'example.com' entry and point to it via the hosts file, it comes up fine.
Never seen this before. Any ideas?