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OSSEC / HIDS Rule 501
- Rule family: OSSEC / HIDS
- Rule ID: 501
- Definition status: Present in current source
- Alert message / subject: New ossec agent connected.
- Rule level: 3
- Definition checked: 2026-10-21
Interpretation and response
The agent connected to the OSSEC manager. Confirm that the agent identity and connection were expected.
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 copied Windows audit-failure message in the wiki Infobox was incorrect.
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.
Description
The agent connected to the OSSEC manager. Confirm that the agent identity and connection were expected.
What you should do
Review the originating event, expected activity and configuration. Confirm the actual response separately.
Troubleshooting
False Positives
A legitimate event may still trigger this rule. Review the surrounding activity before deciding whether it is malicious.
Tuning Guidance
There is no guidance for tuning this rule, this is a generic OSSEC event and the rule should not be disabled.
Additional Information
Support
If you are unsure about how to respond to this alert, please contact Atomicorp support. We’re here to help you!
Source and revision
Migrated from HIDS_501, wiki page 790, revision 6152 (20201022). 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 .