How to solve L2TP VPN Error 809 & 789 with Windows 7 x64

How to solve L2TP VPN Error 809 & 789 with Windows 7 x64

How to solve L2TP VPN Error 809 & 789 with Windows 7 x64
I have a Windows 2008 Server to which I am trying to open a L2TP VPN connection on a Windows 7 x64 client. I am using a pre-shared key.I have successfully connected to the Server with a 32 bit Vista client and a 32 bit XP client. I use the exact same settings, internet connection, firewall, etc. on the Windows 7 64 bit client with no luck.I have spent 8 hours searching the internet and attempting different solutions. I have found a handful of people experiencing this problem. Common advice is to:1. Check firewall settings.2. Check that pre-shared key is correct.3. Modify registry to allow NAT Traversal with AssumeUDPEncapsulationContextOnSendRule=2.4. Make sure "IPsec Policy Agent" and "IKE and AuthIP IPsec Keying Modules" services are running.I can get XP and Vista clients to connect on the same internet connection so 1 is out. So is No. 2, I double-checked it and again, it works on other machines. I did No. 3 and it made no difference. The services are running as described in No. 4.One poster stated that he "restored" his Windows 7 machine and the VPN suddenly started working again. He did not specify what he rolled back.Any ideas? I would be eternally grateful, my world has come to a standstill because of this issue.

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