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Sensible brute force threshold before alerting?
Five failures a minute catches everyone who fat fingers their password. What do people actually use?
Five failures a minute catches everyone who fat fingers their password. What do people actually use?
Thresholds alone are always either noisy or useless. What helps more is what happens next.
Failures followed by a success from the same source is the alert worth waking somebody for. Failures on their own are background radiation on anything internet facing.
If you want a number, 30 in a minute from one source catches automation without catching humans. Tune per service though, SSH on a public address and an internal app should not share a threshold.