> Source: [sk182807](https://support.checkpoint.com/results/sk/sk182807)

# sk182807 - Security Gateway drops packets with fwconn_chain_rematch_cache FAILED when ISP Redundancy enabled

| Property | Value |
|----------|-------|
| Solution ID | sk182807 |
| Date Created | 2024-11-04 |
| Last Modified | 2025-01-27 |
| Technical Level | General |
| Products | Security Gateway |
| Versions | R82, R81.20, R81.10 (EOS) |

## Symptoms

- * After upgrade, users have an unstable connection to resources behind a Security Gateway when ISP Redundancy and QoS blades are enabled.
* The Security Gateawy drops packets. Output of "`fw ctl zdebug + drop`" shows:

  ```
  
  [fw4_19]:fw_log_drop_ex: Packet proto-17 1.2.3.4:12660- > 5.6.7.8:53 dropped by fwchain_continue_do Reason: fwconn_chain_rematch_cache FAILED, while trying to update the connection cache on the chain:
  ```

* Traffic captures show that the dropped packets arrive to the second ISP link configured in the ISP Redundancy blade.

## 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 10
* [Jumbo Hotfix Accumulator for R81.20](https://sc1.checkpoint.com/documents/Jumbo_HFA/R81.20/Default.htm) starting from Take 90
* [Jumbo Hotfix Accumulator for R81.10](https://sc1.checkpoint.com/documents/Jumbo_HFA/R81.10/Default.htm) starting from Take 171

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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