I suspect you issue here is a miss match in the authentication method, the default authentication method for L2TP and PPTP is MS CHAP v2 which will require authentication via a RADIUS server (such as NPS). In order to directly authenticate against Active Directory Services directly you will need to modify the authentication method, this can be performed at the console. Execute the following command to set authentication method for L2TP users: console> set vpn l2tp authentication OR Execute the following command to set authentication method for PPTP users: console> set vpn pptp authentication You can try either PAP, CHAP or any. However from a security perspective I would strongly recommend you implement NPS and use MS CHAP v2
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