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PPTP and L2TP Port Forwarding

PPTP and L2TP Port Forwarding | VPN and NAT-T A recent VPN project for two customers required configuration of Port Address Translation through a NAT Devices (one Cisco ASA and one Sonicwall) onto Windows Remote Access Servers (RRAS with NPS) We decided to post some information regarding port forwarding of[…]

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VPN and RAS Error 812

A common VPN error we have experienced had recently re-appearred.  The error message reports as follows: 812: The connection was prevented because of a policy configured on your RAS/VPN server. Specifically, the authentication method used by the server to verify your username and password may not match the authentication method[…]

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Windows 8 VPN Errors 809 and 850

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[…]

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