Cisco AnyConnect “Failed to initialize connection subsystem”

Chris Tierney

Update 2/16/2015 16:11 CST:

Per Cisco: Microsoft has released a fix-it patch providing a workaround for this issue. See KB# 3023607

When you visit the KB page, it appears you have to scroll down to the “Microsoft Fix It” button and install the AppCompat shim which is Microsoft Fix it 51033. This is a bit confusing, so be sure to click that button.

Microsoft is planning to include the fix with the Microsoft March Patch Tuesday release (subject to change)


I run Windows 8.1 and run Cisco AnyConnect Secure Mobility Client version 3.1.03103 to access a VPN.

Today, after I hit connect, it stopped working out of the blue with the error:

Failed to initialize connection subsystem

Thanks to ‘I Think – Therefore “IBM I”‘ blog I was able to quickly resolve the issue. I’m assuming this had to do with a recent Windows Update. Here’s the final solution:

  1. Close the Cisco…

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