Allied Telesis VPN - Manual (Page 27)

Configuring the VPN client > Configure the connection
Page 27 | AlliedWare™ OS How To Note: VPNs with Windows 2000 clients, without NAT-T
11. Click OK.
This completes the configuration of the L2TP client. To connect to the office, click Connect.
Note that the connection will fail if the router has not yet been configured.
If the connection succeeds, the following dialog box displays. Click OK.