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SonicWALL Net Extender stops being able to establish VPN connections

Posted on 2016-09-27
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Last Modified: 2016-12-25
A user running Windows 10 Professional 64-bit on her computer has a problem where the SonicWALL Net Extender software will stop working after it has been running on her computer for a couple days.

This happens even after we have completely exited out of the SonicWALL program and have made sure that all aspects of it are no longer running.

She will launch the Dell Sonic WALL Net Extender program and the program won't establish a VPN connection to the SonicWALL router in her office until her Windows 10 computer is rebooted.

Once the Windows 10 computer has been rebooted then the SonicWALL program will then be able to once again connect to the SonicWALL router in the client's office using a VPN connection.

We have tried changing the SonicWALL program settings so it will run in Windows 8 or Windows 7 mode within Windows 10 and this won't fix this issue.

Additionally we have uninstalled this Dell Sonic WALL software and have reinstalled it many times but the same issue continues to occur.

What else can be done to fix this issue so that the Dell SonicWALL VPN software will be able to run and establish VPN connections without having to constantly reboot the Windows 10 OS?

The Net Extender Windows client version information is listed below:

Net Extender Win client version
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Question by:Knowledgeable
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Blue Street Tech earned 2000 total points
ID: 41818927
Hi Knowledgeable,

I've seen an issue similar but more specifically with laptops where users were closing their laptops without first exiting the NetExtender connection. In these scenarios, Tunnel All mode was implemented so once the laptop lid was opened again the connection would not be able to route regardless of the status of the NetExtender (running, exited). A reboot was needed in order for the connection to connect once again let alone for the NetExtender to function properly. Since then we have instructed our end-users to disconnect their connection before closing their laptop lids.

I  had never seen any issues with NetExtender until Windows 10.

I'd completely uninstall the NetExtender including the profile/settings reboot then download the latest version, which is 8.0.241 and try again. Before you reinstall NetExtender disable all antivirus/malware software.

I'd also enable Packet Capturing on the NetExtender too and start a capture on the next established session.

Any disruption in the connection can close the tunnel even if persistence (Settings > Automatically reconnect when computer resumes or when the connection is terminated) is enabled, because it depends on the SSL-VPN settings on the Network Security or SRA appliance, which can disregard these settings due to credential caching settings.

Are you running WXA (WAN Acceleration) on the Firewall appliance?

Is the end-user connecting to a Network Security appliance (TZ or NSA series firewall) or an SRA (Secure Remote Access appliance)?

Let me know how it goes!
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Author Comment

by:Knowledgeable
ID: 41819983
Can you provide me with the URL hyperlink to download the Netextender  8.0.241 client from the Dell SonicWALL website?
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Expert Comment

by:Blue Street Tech
ID: 41822552
Yes, you need to login to https://www.mysonicwall.com and go to the Download section on the left. There is no public site that hosts the application for download but you can enable settings within the SSL-VPN to auto download & auto update the NetExtender Client.

Let me know how it goes!
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by:Blue Street Tech
ID: 41837726
Any update on this?
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Author Comment

by:Knowledgeable
ID: 41838895
I'll be working on this next week and will update this posting then.
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Expert Comment

by:Blue Street Tech
ID: 41838907
Great. Let me know...thanks!
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