SonicWall Management via L2TP VPN
You do not have the administrative privilege required to login here.
Note that you are currently logged in to the DELL SonicWALL as a L2TP Client user and login here is only allowed for management of the appliance. Since you do not have the privilege for that, please re-connect using an account with administrative privilege.
Please contact your system administrator for further assistance.
Obvious – make sure the user is a member of Sonicwall Administrators group. But you did that before you came here.
Less obvious – make sure HTTPS administration is enabled on the WAN interface. This is done on the configuration page of the X1 interface.