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ITsVISTA KB-Link: KB950826

You cannot establish an IPsec connection between a Linux operating system and a Windows Vista operating system when you initiate the connection from the Linux operating system

Consider the following scenario. You use Windows Vista Local Security Policy on a Windows Vista-based computer. Or, you use the new Windows Firewall with Advanced Security on a Windows Vista-based computer. You try to initiate an Internet Protocol Security (IPsec) connection from a Linux-based computer to the Windows Vista-based computer. In this scenario, you cannot establish the connection.


  • If you initiate the IPsec connection from the Windows Vista side, the connection is established correctly.
  • Windows XP and Windows Server 2003 work correctly with the Linux operating system in this environment.
There is a download that resolves this issue. See Hotfixes for details.

For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB950826.

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