Thanks for your post.
I need to collect more information before going further. Please help answer
the following questions.
1. Did you configure the L2TP/IPSec connection by using pre-shared key or
certificate for authentication?
2. Did the issue also occur on other Vista machines?
3. If possible, to narrow down the issue, could you please try PPTP VPN on
the same Vista machine and check whether this works?
4. Please tell me the information of VPN server and provide the detailed
VPN settings on server side. (Please tell me detailed parameters of IPsec
Thanks for your time and I look forward to hearing from you soon.
Microsoft Online Support
Microsoft Global Technical Support Center
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