# NAT unfold failure when Security Zone used in NAT rulebase

**Product** Security Gateways  
**Version** R81.10 (EOS), R81.20, R82  
**OS** Gaia  
**Last Modified** 2025-06-15

## Symptoms

- After enabling Security Zones in NAT rulebase, wrong IP address is shown in logs and NAT is performed incorrectly.
- Traffic that goes through the Anti-Spam blade gets its Source IP NATed. Although there is a NAT rule concerning this traffic, it says Source: Original.

## Cause

When doing unfold, the Security Gateway was looking up the wrong connection in Security Zone flow.

## Solution

This problem was fixed. The fix is included in:

- [Jumbo Hotfix Accumulator for R82](https://sc1.checkpoint.com/documents/Jumbo_HFA/R82/Default.htm) starting from Take 25  
- [Jumbo Hotfix Accumulator for R81.20](https://sc1.checkpoint.com/documents/Jumbo_HFA/R81.20/Default.htm) starting from Take 101

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://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doGoviewsolutiondetails=&solutionid=sk168597).

#### 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** 2025-01-30  
**Last Modified** 2025-06-15