VPN Setup L2TP connection failure

[JohnLenz]

RAS Server2012 R2 Std, Role Routing & remote access, VPN only (Hyper-V system )

Win10 Pro x64_current upgrade level

I am setting up VPN access only to the 2012R2 server.

1. I have setup security tab with "allow custom IPSec policy for L2TP/IKEv2 Connection" with a preshared key
2. Authentication methods are MSCHAP V2 & Encrypted Authentication

Router forwarding:

1. Protocols: IPSec, PPTP,L2TP Passthrough
2. PPTP TCP 1723 to RAS server
3. IPSec UDP 500 to RAS server
4. IKEESP TCP 50-51 to RAS server
5. L2TP UDP 1701 to RAS server
6. IKE NAT UDP 4500 to RAS Server

Win10 client VPN Adapter security tab:

Preshare Key entered identical to RAS server




Issue ( I am attempting to connect the Win10 client on same office network as server for the test)

1. Execute "connect" on VPN Adapter
2. Clinet has Allow remote access in AD
3. Enter Domain Credentials
4. Error that comes back is: "Can't Connect to VPN. The L2TP connection attempt failed because the security layer encountered a processing error during initial negotiations with the remote computer"

What do I need to fix to get VPN access?

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John Lenz

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