Another patch released by Microsoft this month is causing problems. This time it is KB3023607,which was supposed to mitigate the POODLE vulnerability. Once applied, Cisco AnyConnect users are no longer able to connect to their VPN.

For more details, also see the Cisco bug report https://tools.cisco.com/bugsearch/bug/CSCus89729 (requires login).

The issue appears to affect Windows 8.1, in which case running the application (vpnui.exe) in Windows 8 compatibility mode will fix the problem for now.

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Johannes B. Ullrich, Ph.D.
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