Unfortunately, the version provided by most of these sites is out-of-date as most SonicWall VPN devices never get updated. In my case, the version of NetExtender for Mac, 6.0.719, on my company SonicWall works on 10.8 Mountain Lion, but fails on OS X 10.9 Mavericks. One solution is to upgrade all the company SonicWalls.

My office is protected by a SonicWALL firewall device, necessitating the use of their NetExtender client app for SSL-based VPN connectivity. Unfortunately, the introduction of Mac OS X 10.9 wreaked havoc with that app’s functionality.

SonicWALL isn’t exactly doing a great job of keeping their utility apps up-to-date and NetExtender is a perfect example. The current “general release,” v7.0.741 (released in Feb. 2013) is unable to retain a reliable connection (it drops after only just a few minutes) and the currently available “early release,” v7.5.216 (released in April of this year), while it fixes this issue, BREAKS the ability to create a proper tunneling connection.

Quick sidebar:
“Tunneling,” for those who may not know, is a VPN connection where ALL traffic goes through the host firewall and out its Internet connection, thereby making it appear as if the remote client is actually within the host network. By default, mot VPN connections only send traffic destined for the host network through the VPN connection; all other traffic is sent via the client’s normal Internet connection.

While this doesn’t really matter if your clients are only using VPN to access internal resources, it IS a problem if they’re doing testing against external servers that are only permitting traffic from our office’s external IP address!

Fortunately, a protracted call with SonicWALL technical support procured an in-house version of NetExtender, v7.5.765, that solves the problem. Considering how slow they tend to be about releasing updates, I thought I’d offer it up for those in a similar bind.

Download NetExtender v7.5.765 here.

Issue:

Unable to connect to Sonicwall Netextender VPN.

Error Message:

App Screen: Netextender disconnected unexpectedly. Possible causes: Network disruption, Idle timeout or ended by admin.

Sonicwall Netextender For Mac

Log: Please delete and reinstall Netextender, or run chmod u+s /usr/sbin/pppd as administrator. You can find the logs icon in the lower left corner.

Solution:

Based on this error message, it should be practically easy to solve, right? You just go to your Terminal and run the command suggested.

I even tried to sudo, and it's still failed.

Here's what I learned..Mac OS Sierra is actually blocking it due to security purposes (System Integrity Protection). In this case, we will try to disable it for the meantime.

1. Reboot your MacBook and hold the Command+R key to reboot in Recovery Mode.

Netextender for mac download

2. Choose your language preferred then Continue.

Skype for mac 10.7.5. 3. Open the Terminal window. Select Utilities->Terminal from the menu above.

4. Disable the System Integrity Protection by using the csrutil command.

5. Reboot your MacBook. This time, do not hold any keys so it will reboot normally.

6. Open the Terminal window and run the same command above to change the permission of pppd

This time, it will be successful :-)

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But, if ever you encounter 'Operation not permitted', try to sudo the command.

then enter your admin password.

You will notice that the pppd user permission was changed from X to S

BEFORE:

7. Reinstall your Netextender app.

Go to Applications using Finder then drag the Netextender to Trash (usually, it's located on your lower left corner of your screen).

Now, open your Netextender installer (In my case, Im using the NetExtender.MacOSX.8.5.788.dmg) then drag the Netextender app to Applications.

8. Now, try again to connect to your VPN using the Netextender. You should be good this time!

9. Once your done in your VPN, enable back your System Integrity Protection for your own security :-) I guess, by this time you have an idea on know how to do it, right?)

- Follow step 1 to 5. But this time on step 4, replace disable to enable