Good morning Radek, I have a suspicion ...
For (1), (2) and (3) VPN is working just fine with Win7_warrior and puffy_warrior if they are connecting from A.B.C.0/23 (it does not matter if warrior has public IP or it is behind NAT). The rest of the world fails to connect the VPN_server.
My question was concerning the VPN_server, is the server NATed? How is A.B.C.0/23 connected to the 'rest' of the world? Router/Firewall ... Cheers, Kim
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