# 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](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, **follow these instructions**:

Enable the SIP handlers according to your network topology by following the instructions in [sk95369](https://support.checkpoint.com/results/sk/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:

1. `fw ctl set int dispatch_port_1_tap <PORT_NUMBER>`  
2. `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](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**: 2025-01-29  
**Last Modified**: 2026-04-18