PPTP/GRE traffic fails when Hide NAT is used and SecureXL runs in UPPAK mode

Product

Security Gateways

Version

R81.20, R82, R82.10

Last Modified

2026-07-23

Symptoms

• PPTP connectivity fails when traffic passes through a Security Gateway that uses Hide NAT.
• The PPTP TCP control channel establishes, but the GRE data channel does not pass traffic.
• The behavior occurs when SecureXL is enabled in UPPAK mode.

Cause

In some scenarios, when SecureXL operates in UPPAK mode, a PPTP/GRE enforcement‑related setting is updated in the Firewall layer but is not applied in SecureXL.

Because SecureXL does not use the updated enforcement context, GRE data traffic is not processed correctly when Hide NAT is configured.

Solution

This problem was fixed. The fix is included in:

• Jumbo Hotfix Accumulator for R82.10 starting from Take 36
• Jumbo Hotfix Accumulator for R82 starting from Take 118
• Jumbo Hotfix Accumulator for R81.20 starting from Take 158

If you choose not to upgrade, Check Point can supply a Hotfix. Contact Check Point 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 from the Security Management Server and Security Gateways involved in the case.

Hotfix installation instructions: Refer to sk168597 - How to install a Hotfix.

These workarounds are also available:

• Workaround # 1 - Switch the NAT mode to static NAT (see sk172933).
• Workaround # 2 - Switch the SecureXL mode from UPPAK to KPPAK (see sk153832).

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: 2026-02-06 Last Modified: 2026-07-23