Cisco AnyConnect drop WiFi connection

[piotr_berent1]

Hello,

I'm facing strange behavior of Cisco AnyConnect Secure Mobility Client.
It works great when I'm using ethernet cable connection.
However while trying to connect using WiFi connection - VPN client allow me to login, but after that imidiatelly it drops WiFi connection and disabling WiFi service on my laptop.

I'm using:
Cisco AnyConnect Secure Mobility Client 3.1.09013
Intel Dual Band Wireless-AC 8260 with newest drivers

Windows 10 Pro with all recent updates.

So far I've tried - reinstalling VPN client, reset network function in Windows 10 - which removes all network devices from the system and reinstalling it once again. Nothing works. Windows firewall is completly disabled for all network profiles.

[chris.meissner]

I think you are having a different issue than this.  In our case, the wireless connection was dropping (which would take out the VPN) and then it would come right back.  But the VPN would never be able to be connected.  The fix has been consistent for us.  If you are getting dropped and able to connect to the VPN after it comes back, then you have a different issue.  Sorry.

[Freestyler]

Here's a virtual hug for you pwasik!!!

I cannot even begin to calculate the number of hours I've spent trying to solve this issue. I think I started seeing it around the introduction of Windows 7 back in 2009.

I have initiated a few tac-cases, I have spoken with 10+ network specialists in my company. I have spent weeks googling. No one have been able to assist.

The problem is really annoying, but after 20-30 disconnects/reconnects the tunnel seem to stabilize. So I haven't considered it a major issue.

But after having tried your sim.connections setting I now have a fully functional Anyconnect.

Thank you!!!

[cvms1]

Confirming that disabling (Unchecking) the LAN/WLAN Switching in HP BIOS resolves this issue

In my case this was on an HP EliteBook G4.

The GPO tweak was un-needed in my case.

Kudos to the user who posted the original solution!

[Ketan Sanil]

Disabling my "VirtualBox Host-Only Network" adapter worked for me Wi Fi and internet stable.

[AlexandrKudryavtsev]

I have same issue on my laptop ACER V3-571G and Xubuntu 18.04.
I use Cisco AnyConnect Secure Mobility Client Version 4.8.03036
I have router ASUS RT-AC59U.
Problem starts any time when i start secure connection to my work office.
All works fine for 1 minute, and after that WiFi connection drops. WiFi connection
itself is still active, but without access to Internet. This affect to ALL WiFi
devices currently connected to my router.
I see many ARP queries without answer like "who has 192.168.27.1(my default gateway)"
I think that problem is at level 2 with ARP protocol. My WiFi devices can't get IP of default gateway over RTP query.

If Any Connect secure connection not active - all works fine !!!
I know that some of my colleagues have the same problems.

[gorgonmcque]

So I have Windows 10 Pro running with intel wireless and AnyConnect 4.9

I had a similar issue except that after I installed the AnyConnect client my wireless would take forever to connect and then when it did it would say no internet.

Nothing worked as far as any of the suggestions I found here.

What did work was to uninstall all AnyConnect modules. Reboot. And then ONLY install the "Core & VPN" module.  Reboot again.  After that all was fine.

[edayi]

I have the same problem for Macbook air, High Sierra 10.13.6. I wonder if any apple users found a solution to this very annoying problem yet. Thanks!

[Paulnboomer]

Hi I had the same issue and when checking in manage and viewing by driver it was relating to oem64 inf (netwtw06.inf). It i simply deleted the adapter and drivers . Then installed driver version 20.70.30.1 from windows update "intel lan" . No issues for 3 weeks now, before it was every few hours .It used to drive me mad as suddenly no wifi, removing shutting down going in to the bios loading default saving and reboot reenabled the adapter .