> Source: [sk173765](https://support.checkpoint.com/results/sk/sk173765)

# sk173765 - SSL Network Extender (SNX) disconnects randomly after upgrade to R81.x 

| Property | Value |
|----------|-------|
| Solution ID | sk173765 |
| Date Created | 2021-05-30 |
| Last Modified | 2024-03-11 |
| Technical Level | General |
| Products | Security Gateway |
| Versions | R81.20, R81.10 (EOS), R81 (EOS) |

## Symptoms

- * SSL Network Extender (SNX) disconnects randomly after upgrade to R81, R81.10, or R81.20.
* SNX disconnects randomly on Chrome, Edge (based on Chromium), Firefox or Safari. The disconnection can happen within 2 minutes of being connected, or within a few hours.
* These records can be found in the Portal Agent's log file (`%temp%\CShell\cshell.elg`):  

  ```
  
  INFO [TunnelChecker] (TunnelChecker$DisconnectChecker run) Reached tunnel connection timeout. Disconnecting...
  [global] (Log log) [Director] Disconnecting the component.
  [global] (Log log) [Messaging] Sending DISCONNECT message
  ```

## Cause

The issue takes place because of the "JavaScript throttling" feature of the Chromium engine. When this feature is enabled, the browser dramatically slows down JavaScript execution in non-active tabs. This affects the data exchange flow between the Portal Agent and the browser and results in SNX disconnection.

## Solution

**Overview**

This problem was fixed. The fix is included in:

* [Jumbo Hotfix Accumulator for R81.20](https://sc1.checkpoint.com/documents/Jumbo_HFA/R81.20/Default.htm) starting from Take 26
* [Jumbo Hotfix Accumulator for R81.10](https://sc1.checkpoint.com/documents/Jumbo_HFA/R81.10/Default.htm) starting from Take 110
* [Jumbo Hotfix Accumulator for R81](https://sc1.checkpoint.com/documents/Jumbo_HFA/R81/Default.htm) starting from Take 87

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