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

## 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

#### 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: 2021-05-30
- Last Modified: 2024-03-11