How to Investigate a Sudden Increase in Failed Login Attempts

A spike may be caused by password spraying, a misconfigured integration, stale clients, or a legitimate change in user behavior.

Checks to make

Segment attempts by source, account, client, and time; check successful sign-ins and MFA outcomes; correlate with deployments and help-desk reports. Apply rate limits or targeted controls based on evidence, and preserve logs for follow-up.

When to get help

Security operations support can triage authentication patterns and tune detection. Informatix Systems can assess the symptoms, evidence, and next steps. Contact Informatix Systems to discuss this issue.