ZyXEL SBG3300-NB00 User Guide - Page 304
Action, IPSec VPN, Setup, Local Gateway Address, Default_L2TPVPN, Status, Edit Default_L2TPVPN,
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Chapter 22 L2TP VPN b. Incorrect server address configured on the client device. Action: From the Device's GUI, click VPN > IPSec VPN > Setup. (1) If the Local Gateway Address for Default_L2TPVPN is set to "Any": From the Device's GUI, click Status. The client device should be configured with one of the WAN interface IP addresses. (2) If the Local Gateway Address for Default_L2TPVPN is an IP address: Use that IP address for the client device to connect. c. The WAN interface which the Device's L2TP VPN is using is not connected. Action: From the Device's GUI, click Status. Check if the WAN interface used by L2TP VPN is connected. d. The client device has an incorrect IPSec pre-shared key configured. Action: From the Device's GUI, click VPN > IPSec VPN > Edit Default_L2TPVPN. The client device should use the same pre-shared key. e. The L2TP VPN is not fully enabled. Action: From the Device's GUI, (1) Click VPN > IPSec > Edit Default_L2TPVPN. Select the Enable checkbox and click Apply. (2) Click VPN > L2TP VPN > Setup. Select the Enable checkbox and click Apply. f. L2TP or IPSec is not configured correctly on the client device. Action: Refer to Section 4.13 on page 85 for an example of L2TP VPN. g. The client entered an incorrect username or password. Action: From the Device's GUI, click Maintenance > User Account. The client should use one of the accounts to make the connection. h. The Device exceeds the maximum number of concurrent L2TP VPN connections. Action: There are too many clients connected. Wait a while and then retry. 2 A windows L2TP client fails to connect to the Device with an "invalid certificate" message. Tip: Windows sometimes may show this error even if the client device has been configured with a correct pre-shared key for authentication. This usually happens at the first connection attempt after a new connection profile is created. Reconfigure the pre-shared key on the client Windows device and retry the connection. 3 An L2TP client device cannot reconnect after it is disconnected. Tip: If a client reconnects right after it is disconnected, the reconnection may fail. Wait 60 seconds before reconnecting. 304 SBG3300-N Series User's Guide