Quiz: incident response

Question 4 of 10

One correct answer

lab-app is active, the site answers 502. nginx's error.log has `connect() failed (111: Connection refused) … upstream: "http://127.0.0.1:8000/"`, and `ss -ltn` shows `127.0.0.1:8001`. What happened?

The application answers every request with a 502 error.
nginx and the application went to different ports — nginx goes to 8000, the application waits on 8001.
A firewall cuts nginx's connections to the application.
The application crashed — active shows the past state.

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