Hi I'm trying to set up a secondhand Nortel 2700 Contivity. When I connect to the Serial Port it asks for the Administrators password. I don't know the Administrator ID or password. As I don't know the Management IP address I can't reset to Factory Defaults using the WEBUI. Is there any way I can reset the Administrator ID and password to the default other than using the WEBUI to the Management IP address.

SOURCE: Nortel Contivity VPN client?

Nortel Contivity will work with the your D-Link router, however its functionality depends on the authentication type (AH will not work), NAT compatibilty mode, and disabling keep alives on the server. Contact your Network Administrator to find out how your VPN is configured. Step 1 Verify that you are using the latest version of firmware on your router. Step 2 Login to the Web Management for your router by entering its IP address (192.168.0.1) in your web browser. The default username is admin, and the password is blank. Step 3 Click the Advanced Tab to access the Virtual Server Settings. There is a list of pre-defined Virtual Server Rules towards the bottom of the page. Find the IPSec Rule. Click the pen and paper icon to edit its settings. Enable the rule, enter the IP address of the computer attempting to connect to the VPN in the Private IP field, then Apply the changes. Step 4 Create a new Virtual Server entry. Name the Virtual Server, "NortelVPN". Enter the IP address of the computer attempting to connect to the VPN in the Private IP field. For the Protocol Type, select Both. Enter 9550 for both the Public and Private Ports. Set the Schedule to always, then Apply the settings. Step 5 Access the Tools Page, then click the Misc button. Disable IPSec Pass-through, then click Apply. If the VPN Server is properly configured to work with clients behind NAT routers you should be able to connect to the VPN.

SOURCE: hot to reset password on contivity 2700 vpn router

see if this helpshttp://blog.michaelfmcnamara.com/2008/09/nortel-vpn-router-configuration-guide/