> Source: [sk181282](https://support.checkpoint.com/results/sk/sk181282)

# sk181282 - Cannot reach websites because of "Streaming Engine: TCP Invalid Retransmission" drops� � �

| Property | Value |
|----------|-------|
| Solution ID | sk181282 |
| Date Created | 2023-07-20 |
| Last Modified | 2025-12-21 |
| Technical Level | General |
| Products | Security Gateway |
| Versions | R82, R81.20, R81.10 (EOS) |

## Symptoms

- * Decrypted traffic traversing the Security Gateway gets dropped for:  
  `Invalid segment retransmission. Packet dropped. Please refer to sk172266.
  Streaming Engine: TCP Invalid Retransmission`  

  Traffic flow:  
  Client \> Decryption Device \> Check Point Gateway \> Re-encryption Device \> Server   

* Disabling Brotli Accept-Encoding on the client or on the decryption device resolves the issue.

## Cause

A TCP retransmission was sent because the server did not respond to the original request. In the original packet on the Check Point Security Gateway, Brotli Accept-Encoding was removed because it is not supported (see [sk179967](https://support.checkpoint.com/results/sk/sk179967)). When a TCP retransmission was sent, the packet contained Brolit Accept-Encoding, but the original packet no longer had it on the Check Point Security Gateway. This is the reason for the "`TCP Invalid Retransmission`" drops.

<br />

## 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 44
* [Jumbo Hotfix Accumulator for R81.20](https://sc1.checkpoint.com/documents/Jumbo_HFA/R81.20/Default.htm) starting from Take 99
* [Jumbo Hotfix Accumulator for R81.10](https://sc1.checkpoint.com/documents/Jumbo_HFA/R81.10/Default.htm) starting from Take 183

If you choose not to upgrade, 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).

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