OSSEC / HIDS Rule 4103

OSSEC / HIDS rule catalog

• Rule family: OSSEC / HIDS
• Rule ID: 4103
• Definition status: Historical / version-dependent
• Alert message / subject: Advanced portscan event

This ID was not found in the reviewed main HIDS rules directory. It may belong to an older release or a generated integration. Check your installed rule bundle before applying its guidance.

Interpretation and response

This event is recorded as “Advanced portscan event”. Review the originating log and the affected host or service to determine whether the activity was 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.

Documentation

This article preserves historical OSSEC/HIDS guidance. This ID was not found in the current main rule directory; the historical status, response defaults and product instructions do not establish its behavior in a current deployment.

Description

Advanced portscan detected, an attacker is using a more sophisticated method of service enumeration

What you should do

No actions recommended

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 error 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_4103, wiki page 896, revision 6262 (20201023). 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 .