The L2TP connection attempt failed because there is no valid machine certificate on your computer for security authentication.
Your connection might be failing for one or more of the following reasons: ò Your computerÆs certificate is invalid, expired, or lacks the private key that it needs. ò None of your computerÆs 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.
Contact your system administrator.