AnyConnect - loss of network interface error

[clamasters]

I am getting the following error when connecting from a single computer.

"The VPN connection was terminated due to the loss of the network interface used

for the VPN connection."

The only reference I can find to this error currently is a person on this forum having the same issue with a VZ Air card (no resolution) and another in a Cisco tech doument that tells me to restart the device but that's it.

I have uninstalled and resinstalled through Add/Remove programs but not much else beyond that.  I can see the VPN hitting the firewall but nothing beyond this.  It appears as though the service doesn't have proper permissions and/or something is automatically shutting of/disabling the interface.

Thoughts?

[Itech24]

I am having this issue as well when attempting to establishing a VPN connection over wireless network. This issue occurs on my home WiFi and at work [2 different WiFi internet connections not on the domain]. However, it works prefect if I use a LAN connection.

Here the detailed log:

1/3/2018
     2:49:17 PM    User credentials entered.
     2:49:27 PM    Establishing VPN session...
     2:49:27 PM    The AnyConnect Downloader is performing update checks...
     2:49:27 PM    Checking for profile updates...
     2:49:27 PM    Checking for product updates...
     2:49:27 PM    Checking for customization updates...
     2:49:27 PM    Performing any required updates...
     2:49:27 PM    The AnyConnect Downloader updates have been completed.
     2:49:27 PM    Establishing VPN session...
     2:49:27 PM    Establishing VPN - Initiating connection...
     2:49:27 PM    Establishing VPN - Examining system...
     2:49:27 PM    Establishing VPN - Activating VPN adapter...
     2:49:27 PM    Establishing VPN - Configuring system...
     2:49:27 PM    Disconnect in progress, please wait...
     2:49:27 PM    The VPN connection was terminated due to the loss of the network interface used for the VPN connection. <--- You can witness my WiFi connection goes offline
     2:49:27 PM    AnyConnect was not able to establish a connection to the specified secure gateway. Please try connecting again.
     2:49:27 PM    Ready to connect. <---  My WiFi connection returns to normal (online)

This did work at one point and don't know what changed that is now causing this issue.

[Mohammed al Baqari]

Have you tried to uninstall the client and install it again. Seems like bug
behavior. Try to use different version of anyconnect client.

If still same, generate DART report.

[Itech24]

Hi Mohammed,
I am working from home today and will have to wait until I return to the office to try the uninstall/reinstall. Thank you for your reply.

Question: when I perform the Uninstall should I manually delete all references to AnyConnect Client?

[Ben Walters]

I have found that AnyConnect does well if you are upgrading to a higher version, just install over the old version without uninstalling AnyConnect.

If you are just reinstalling the same version though yes, it's best to remove all traces of the AnyConnect program (registry too) before trying to install again.

[Itech24]

Thank you for your reply to my posted issue with AnyConnect.



This was the first thing we tried. I was using version 4.2 and performed an in-place upgrade to 4.4 however this did not resolve the issue.

[Itech24]

I completely uninstalled the AnyConnect and reinstalled with version 4.4.02039 and no luck. it had no affect and did not resolve.

     10:38:45 AM    Ready to connect.
     10:39:59 AM    Ready to connect.
     10:40:30 AM    Contacting xx.xxxxxxx.com.
     10:40:38 AM    User credentials entered.
     10:40:39 AM    Establishing VPN session...
     10:40:39 AM    The AnyConnect Downloader is performing update checks...
     10:40:39 AM    Checking for profile updates...
     10:40:39 AM    Checking for product updates...
     10:40:39 AM    Checking for customization updates...
     10:40:39 AM    Performing any required updates...
     10:40:39 AM    The AnyConnect Downloader updates have been completed.
     10:40:44 AM    Establishing VPN session...
     10:40:44 AM    Establishing VPN - Initiating connection...
     10:40:44 AM    Establishing VPN - Examining system...
     10:40:44 AM    Establishing VPN - Activating VPN adapter...
     10:40:48 AM    Establishing VPN - Configuring system...
     10:40:48 AM    Disconnect in progress, please wait...
     10:40:52 AM    The VPN connection was terminated due to the loss of the network interface used for the VPN connection.
     10:40:52 AM    AnyConnect was not able to establish a connection to the specified secure gateway. Please try connecting again.
     10:40:52 AM    Ready to connect.