Sunday 15 February 2015

Cisco Anyconnect stops working on Windows 8.1 after Internet Explorer patch KB3021952

A recent patch to Internet Explorer (KB3021952) has broken Cisco AnyConnect v3 on Windows 8.1. I'm not able to test v4 as we don't have access to it. It looks like the concept of on-line\offline working has disappeared causing AnyConnect to become confused and believe that it is permanently offline.

The message I kept getting said that the VPN susbsystem was unreachable.

The article below mentions a registry change, but this didn't work for me. The comments suggested running the GUI part of Cisco AnyConnect in Windows 8 compatibility mode, and this indeed did work for me.
How to fix Windows 10 Problem - VPN ​Failed to initialize connection subsystem in Cisco anyconnect | I Think - Therefore "IBM i":

'via Blog this'


  1. The fix for this will likely have to come from Microsoft rather than Cisco as it's a regression in an SChannel API call that AnyConnect is making to SslEmptyCache function. I`m done with ciscoanyconnect, purevpn works like a charm in windows 8.1.
    Purevpn review here.

    1. New job, new VPN, means I'm now using AnyConnect 4, and v4.2.02705 doesn't have this issue on Windows 10.

  2. PureVPN is also working on Windows 10. Check this Latest PureVPN Review for more details.

  3. Try PureVPN its compatible for windows 10. Check out PureVPN review here.