Troubleshooting Old Versions of SonicWall SSL VPN Client with netExtender

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If you're experiencing issues connecting to your company network via the SonicWall NetExtender client, particularly after upgrading or re-installing Ubuntu, this article aims to guide you through troubleshooting and resolving these problems.

Symptoms

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* Upon launching the NetExterversion 3.0.x on a freshly installed Ubuntu system (Jaunty in my case), an error message appears in your terminal window.

* The error typically indicates that there was trouble establishing a connection to the server, despite entering valid login credentials successfully.

Possible Causes

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1. Incompatible or outdated versions of NetExtender and SonicWall SSL VPN client:

* Ensure you're using the latest version compatible with both Ubuntu Jaunty (9.04) and your Sonicwall appliance's firmware.

2 Network-related issues:

- Check whether your network connection is stable

- Verify that no firewalls are blocking traffic between your computer, router or modem

Troubleshooting Steps

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### Step 1: Update NetExtender to the Latest Version

Before proceeding with further troubleshooting steps, ensure you're running the latest version of netExtender. To do this:

1. Open a terminal window on your Ubuntu system.

2. Type `sudo apt-get update` and press Enter to refresh package index information from online repositories.

### Step 2: Disable IPv6 (Optional)

Some users have reported resolving connectivity issues by temporarily disabling IPv6 networking altogether during the connection process with NetExtender:

1. Open System > Network Configuration in Ubuntu Jaunty's menu.

2. Select your primary network interface (e.g., eth0 or wlan0).

3. Click on Edit button next to IPv4 and then click 'IPv4 Preferences' below.

### Step 3: Force SSLv3/TLSv1 Protocol Negotiation

As a last resort, you can force NetExtender to use older protocol versions by adding the following parameters when launching netExtender:

```

-netexteroption -sslVersion tlsv1

```

If none of these steps resolve your issue, please provide more detailed information about your environment and any error messages you're encountering.

Old versions sonicwall ssl vpn client