[UAG] SSL Network Tunneling : Connection ended

I recently got the following issue while using the SSL Network Tunneling connector:

Indeed for deploying VPN access for Windows Xp I use this feature of Forefront UAG (required by the customer).

On a Windows Xp client all goes fine and no problem about the VPN access but on a Windows 7 client after initializing the VPN tunnel I got the following message « Forefront UAG Remote Network Access Connection Ended »:

After investigating and searching on the community knowledge:

• No error related to the certificate (thanks to Inderjeet Singh for his article UAG SSTP VPN ends immediately when connecting)
• None of the solution available on the Microsoft forum solved the problem
• No error on the network trace

After opening a ticket support with Microsoft this « legacy » access is not compatible with Windows 7 and at the date of this article no reference to this is available on the TechNet or on the official documentations.

Thank you to Olivier Bertin and his colleague of the Microsoft France support team for the solution.

I will soon make article about how to implement VPN access with Forefront UAG stay tuned :)