Windows VPN Error

ccgs used Ask the Experts™
Morning, I am trying to setup a Windows 2016 VPN via LT2P but keep getting the below error.
Anyone know what I can do to fix it?

During main mode negotiation, IPsec received an invalid negotiation packet. If this problem persists, it could indicate a network issue or an attempt to modify or replay this negotiation.
Local Network Address:
Remote Network Address:
Keying Module Name:      IKEv1
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Qlemo"Batchelor", Developer and EE Topic Advisor
Top Expert 2015

You are using local addresses, so probably packages went in unencrypted (using the LAN) instead of using the VPN - or vice versa.
Why are those local addresses, and are they identical to the real LAN IPs "protected" by the VPN?

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