sk183072 - Fixing bi-directional connection issues in Quantum Security Gateways

Fixing bi-directional connection issues in Quantum Security Gateways

Product: Security Gateways
Version: R81.20, R82, R82.10
OS: Gaia
Last Modified: 2026-04-18

Symptoms

The Security Gateway drops the traffic.
For example:
@;416268071.163340;[uspace];[tid_5];[SIM4];resume_inbound_from_vm_reinject: dropping packet of for vsid=0 due to loop prevention (nloops=4, pkt_type VM Reinject, prev state Lookup, next state Lookup, in flags 0x4). conn: ;
The connection for the specific UDP port used by Exchange servers for the sync is "Clear" while it must be "Encrypted".
After the Security Gateway reboot, the connection is still "Clear".

Cause

When a network connection is established simultaneously in both directions (server-to-client and client-to-server), the Security Gateway experiences connectivity issues because of incorrect packet dispatching, leading to dropped packets.

Solution

This problem was fixed. The fix is included in:

Jumbo Hotfix Accumulator for R82 starting from Take 25
Jumbo Hotfix Accumulator for R81.20 starting from Take 101

If you choose not to upgrade, follow these instructions:

Enable the SIP handlers according to your network topology by following the instructions in sk95369.

Alternatively, configure global parameters to specify port numbers for connections that may be established simultaneously from both directions.

For that, run these commands in Expert mode:

fw ctl set int dispatch_port_1_tap <PORT_NUMBER>
fw ctl set int dispatch_port_tap_is_activated 1

You can configure up to five ports with these parameters:

dispatch_port_1_tap
dispatch_port_2_tap
dispatch_port_3_tap
dispatch_port_4_tap
dispatch_port_5_tap

To disable this configuration, in Expert mode, run:

fw ctl set int dispatch_port_tap_is_activated 0

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.

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: 2025-01-29
Last Modified: 2026-04-18