Hello@listena,
Before handling this fault, ensure that a reachable route exists between the remote user and the LNS.
The possible causes are:
The user information differs from that configured on the LNS.
In the AAA view, you can check user information configured on the LNS.
The IP address pool on the LNS is incorrectly configured.
No gateway address is specified in the IP address pool or the specified gateway address is incorrect. Run the gateway-list IP-address &<1-8> command to specify the IP address of the virtual template interface as the gateway address.
The authentication modes on the PC and the LNS are different.
Run the display l2tp-group [ group-number ] command on the LNS to check the TunnelAuth field to see whether tunnel authentication is enabled. Windows XP does not support tunnel authentication. If the remote user supports tunnel authentication, check whether the authentication password of the user is the same as that configured in the L2TP group view. For more details, please refer to
https://support.huawei.com/hedex/hdx.do?docid=EDOC1100069307&id=dc_cfg_l2tp_0038_2&lang=en
Glad to help you! Any further questions, let us know.