Error Message:

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The L2TP connection attempt failed because there is no valid machine certificate on your computer for security authentication.

Explanation:

Your connection might be failing for one or more of the following reasons: Your computers certificate is invalid, expired, or lacks the private key that it needs. None of your computers certificates are trusted by the server. If you are a member of an Active Directory domain and need to request a certificate, see To request a certificate. If you are not a member of an Active Directory domain, or you need to request a certificate from the Internet, see To submit a user certificate request via the Web.

User Action:

Contact your system administrator.