Possible causes for L2TP dialup failures are as follows:
- The firewall is configured on the public network or the local PC has the firewall, so L2TP packets are discarded.
- When corresponding L2TP port is disabled or occupied, UDP port 1701 is often used. For example, ACL and NAT are configured. - The user name and password of the LAC are incorrect, or no users are specified for the LNS.
- The configured address is incorrect. For example, the statically configured address of the VT interface is incorrect.
- Tunnel authentication modes are different.
- LCP renegotiation is not configured.
- The IP address allocation is improper. The IP address pool has a small address range or not configured.
- Gateway addresses are not configured in the IP address pool, so gateway addresses are allocated to clients.
- There are unreachable routes.
- In the L2TP group view, the specified tunnel name at the remote end is incorrect.
- The configured authentication domain is incorrect.
- L2TP negotiation fails because control packets sent by clients of the local PC do not carry the SQ.
- When IPSec encryption is used, the IPSec parameters on the two ends of the tunnel are inconsistent.
Possible Cause 1:
The tablet uses the Android 3.0 version.
Solution:
Use Android 4.0 or a later version.
Possible Cause 2:
The browser has a compatibility issue.
Solution:
Use the Android-attached browser or Android-based Chrome.
The possible cause is that Windows Aero is enabled. To disable Windows Aero, perform the following operations:
1. Right-click in a blank area on the PC and choose Customize.
2. Select a non-Aero theme.
If you have more questions, you can seek help from following ways:
