Redis: NOAUTH Authentication required but there is no password setting

Question

I got error NOAUTH Authentication required when I connect to Redis server via command: redis-cli and run ping to check if Redis is

Answer 1

I had the same issue (running on AWS) and discovered our redis port was exposed. You probably had the same. Someone was messing around.

EDIT: The solution: reset your redis password and then (assuming you have it running as a service) restart the service providing the new password