# LightSpeed Acceleration Card may fail to accelerate large data TCP connections at the hardware level

**Product:** SecureXL  
**Version:** R81.10 (EOS), R81.20, R82, R82.10  
**OS:** Gaia  
**Last Modified:** 2026-07-23

## Symptoms

- TCP traffic intermittently fails when it passes through the LightSpeed Acceleration Card on a Check Point Appliance.
  
Mostly, this issue affects large data TCP streams (for example, transferring images larger than 10 MB).

## Cause

The LightSpeed Acceleration Card may fail to accelerate large data TCP connections at the hardware level in this scenario:

1. A Bond interface in a Load Sharing mode (for example, 802.3ad) is configured on the ports of the same Acceleration Card.
2. VLAN interfaces are configured on top of this Bond interface.

## Solution

This problem was fixed. The fix is included starting from:

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

Check Point recommends to always upgrade to the [Recommended version](https://support.checkpoint.com/results/sk/sk95746) ( [Security Gateway](https://support.checkpoint.com/product/73) / [VSX](https://support.checkpoint.com/product/359) / [Security Management Server](https://support.checkpoint.com/product/184) / [Multi-Domain Security Management Server](https://support.checkpoint.com/product/166) / [SmartConsole](https://support.checkpoint.com/product/191)).

If you choose not to upgrade, [contact Check Point Support](https://www.checkpoint.com/support-services/contact-support/) to get a Hotfix for your version.

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

For faster resolution and verification, collect these files:

1. [CPinfo](https://support.checkpoint.com/results/sk/sk92739) file from the Management Server involved in the case.
2. [CPinfo](https://support.checkpoint.com/results/sk/sk92739) file from the Security Gateway / each Cluster Member involved in the case.

**Hotfix installation instructions:**

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

**Documentation:**

[LightSpeed 10/25/40/100G QSFP28 Ports Administration Guide](https://sc1.checkpoint.com/documents/Appliances/100G_Ports_AdminGuide/Default.htm)

#### 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:** 2025-11-06  
**Last Modified:** 2026-07-23