> Source: [sk183441](https://support.checkpoint.com/results/sk/sk183441)

# sk183441 - Security Gateway drops HTTP/2 traffic and generates a core dump file for the FWK daemon

| Property | Value |
|----------|-------|
| Solution ID | sk183441 |
| Date Created | 2025-05-08 |
| Last Modified | 2025-06-23 |
| Technical Level | General |
| Products | Security Gateway, Scalable Platforms |
| Versions | R82, R81.20, R81.10 (EOS), R82, R81.20, R81.10 (EOS) |
| OS | Gaia |

## Symptoms

- * When HTTPS Inspection is enabled, the Security Gateway drops HTTP/2 traffic and generates a core dump file for the FWK daemon.

* The `/var/log/dump/usermode/` directory on the Security Gateway contains a core dump file for the FWK daemon.

* The affected versions are:

  * R81.10: starting from Jumbo Hotfix Takes 170 - T174
  * R81.20: starting from Jumbo Hotfix Takes 89 - T99
  * R82: starting from Jumbo Hotfix Takes 10 - 14

## Cause

A rare issue in HTTP/2 multiplexing may lead to traffic disruption.

## 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
* [Jumbo Hotfix Accumulator for R81.10](https://sc1.checkpoint.com/documents/Jumbo_HFA/R81.10/Default.htm) starting from Take 177

If you choose not to upgrade, [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 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).

*** ** * ** ***

This **workaround** is also available:  

You can disable HTTP/2 support on the Security Gateway, which will cause all web traffic to fall back to HTTP/1.  

**To disable HTTP/2:**

1. `#ckp_regedit -a SOFTWARE\\CheckPoint\\FW1 IGNORE_ALPN_EXTENSION 1`
2. `#fw fetch local`
3. `#cpstop`
4. `#cpstart`

**To re-enable HTTP/2:**

1. `#ckp_regedit -a SOFTWARE\\CheckPoint\\FW1 IGNORE_ALPN_EXTENSION 0`
2. `#fw fetch local`
3. `#cpstop`
4. `#cpstart`

---

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