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OSSEC / HIDS Rule 3913
- Rule family: OSSEC / HIDS
- Rule ID: 3913
- Definition status: Present in current source
- Alert message / subject: Multiple failed logins, 10 failures in 1 hour from the same IP.
- Rule level: 10
- Definition checked: 2026-10-21
- Configured frequency: 10
- Timeframe (seconds): 3600
Correlation values are configuration attributes; event-count behavior depends on the manager version and parent rules.
Interpretation and response
This rule correlates slow repeated Courier authentication failures from the same source. Shared gateways and stale client credentials can also produce these events.
An OSSEC/HIDS event records or correlates activity. Blocking depends on the originating application and any separately configured Active Response policy; an alert alone does not prove that an attack was blocked.
The current definition has level 10. The wiki level-5 statement and its associated shunning advice are obsolete; Active Response must be checked separately.
Documentation
The following guidance was migrated from the historical wiki and reviewed against the rule definition. Legacy ASL product names and interface instructions refer to the versions documented then. Use the current metadata above and your installed configuration when interpreting thresholds, notification settings and response behavior.
Rule ID
3913
Status
The wiki marked this rule Active at the source revision. Current definition status is shown above.
Description
This rule correlates slow repeated Courier authentication failures from the same source. Shared gateways and stale client credentials can also produce these events.
False Positives
Review the event and expected administrative activity. The earlier instructions under this heading applied to the historical description; use the current interpretation above.
Tuning Recommendations
None.
Similar Rules
Source and revision
Migrated from HIDS_3913, wiki page 225, revision 4440 (20140121). Documentation review: 2026-10-21. An archived wiki status of Active is not a current deployment status.
For assistance, provide the rule ID, installed product and rule version, and a sanitized event to Atomicorp support .