Today we ran into an issue where Windows updates: KB3023607 and Cumulative KB3021952 (sinc eit contains 3023607) both when installed break the AnyConnect client.
"Failed to initialize connection subsystem"
That's what the AnyConnect client spits up. The only remedy we had was to roll back those updates and block them from our WSUS servers.
UPDATE: I've discovered that if this is happening on a Windows 8-8.1 machine if you set Compatibility Mode to Windows 8 mode then the client will begin working correctly if that update installed.
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