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issue could be related to incompatible router or network adapter driver, security software blocking or spyware preventing the connection, etc.
I suggest updating the network adapter driver on Windows 7 from manufacture's site and router firmware at the same time first. Booting in clean boot and disabling any security software or firewall.
How to troubleshoot a problem by performing a clean boot in Windows Vista or in Windows 7
Also try the following KB. If it doesn’t work, recreate VPN connection to check the result.
You receive a "741" or a "742" error message when you try to establish a VPN connection by using L2TP/IPsec from a Windows client computer to a VPN server
If this issue persists, please open an elevated command and reset Winsock.
>netsh winsock reset
Then restart the computer and check the issue again.
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