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Windows 8 VPN Errors 809 and 850

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An interesting error we came across today with a Windows 8 Client connecting to a customer site via VPN from a remote network.  The VPN was L2TP with IPSec and the initial error 809 drew us to the usual NAT-T problem.

Current Windows knowledge base guidance for this appears to work fine for Windows 8 (involves modifying the registry): Configure an L2TP/IPsec server behind a NAT-T device

However we then came across error 850, the problem details and solution was as follows:

Error 850: The Extensible Authentication Protocol type required for authentication of the remote access connection is not installed on your computer.

Solution:
Open the VPN Connection Properties > Select the “Security” tab and check “Allow these protocols”, click OK

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