# IOC Feed "Prevent" Action Fails to Block Emails on Quantum Security Gateways Running Gaia R81.20

### Product
Anti-Bot, Anti-Virus, Threat Prevention

### Version
R81.20

### Last Modified
2026-07-23

## Symptoms

- Indicator of Compromise (IOC) feeds with Action: Prevent do not block emails as expected on Quantum Security Gateways.
- The issue occurs across multiple Quantum Security Gateways, not limited to a single device.
- The problem is consistently reproducible: emails from addresses listed in the IOC feed are not blocked.
- IOC feeds work as expected on Quantum Security Gateways running Gaia R81.10, but fail to block on Gaia R81.20.
- IOC entries are present and visible on the Quantum Security Gateways, and the correct Threat Prevention profiles are applied.
- No blocks are observed in logs for Gaia R81.20, while Gaia R81.10 shows successful blocks for the same IOC entries.

## Solution

This problem was fixed. The fix is included in:

- [Jumbo Hotfix Accumulator for R81.20](https://sc1.checkpoint.com/documents/Jumbo_HFA/R81.20/Default.htm) starting from Take 158

If you choose not to upgrade, Check Point can supply a **Hotfix**. [Contact Check Point Support](https://www.checkpoint.com/support-services/contact-support/) to get a Hotfix for this issue.

A Support Engineer will make sure the Hotfix is compatible with your environment before providing the Hotfix.

For faster resolution and verification, please collect [CPinfo files](http://supportcontent.checkpoint.com/solutions?id=sk92739) from the Security Management Server and Security Gateways involved in the case.

**Hotfix installation instructions:**

Refer to [sk168597 - How to install a Hotfix](https://support.checkpoint.com/results/sk/sk168597).

- After applying the hotfix, confirm that emails from addresses listed in the IOC feed are blocked as expected.
- Check Threat Prevention logs to ensure blocks are recorded for IOC entries with Action: Prevent.

#### NOTE

This solution has been verified for the specific scenario, described by the combination of Product, Version and Symptoms. It may not work in other scenarios.

## Article Properties

Access Level: General

Status: Approved by TAC

Date Created: 2025-09-21

Last Modified: 2026-07-23