I have setup a new Microsoft RAS VPN with user certificate authentication. It works great on IPv4. I have setup IPv6 in our DMZ because our phone carrier (for staff hot-spotting) is now IPv6.
The problem is that after successfully establishing a connection on a IPv6 client, traffic is sent on the connection (which is all IPv4) but nothing is ever received. Our internal servers also never receive the traffic from the RAS server. I used our Fortigate sniffer to confirm this.
Oddly, I can connect from a IPv4 network (client-side), then change to a IPv6 network, allow IKE connection to re-connect and it works fine! But if I manually disconnect and connect again traffic fails.
It is possible that this is nothing to do with IPv6. I only have one ISP with IPv6 that I can test.
$5 worth of Bitcoin Cash to anyone that can solve this for me.
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