User's Manual

Troubleshooting Procedures
199
SMCD3GNV Wireless Cable Modem Gateway User Manual
c. Use the Channel Selection and Channel settings in the Wireless menu to select the
Gateway’s channel settings (see “Viewing and Editing Wireless Configuration” on page
49).
Note: You do not have to change your computer's configuration, because it automatically
detects the new channel.
Unable to Connect to a Wireless Network Using Windows XP and Vista
If you encounter the following when connecting to a wireless network using a Microsoft
Windows XP or Vista computer and the Gateway:
 A message appears after entering the appropriate network or passphrase for a wireless
connection where
Validating identity replaces the name of the wireless network,
 A pop-up window asks for login credentials for the wireless connection, and
 The following error message appears: Windows was unable to find a
certificate to log you on to the network.
Use the following procedure to create or add a wireless network profile manually on the
computer.
To add a wireless network on a Windows Vista computer manually
1. From the Windows task bar, click Start and select Network.
2. Select Network and Sharing Center.
3. Click Manage wireless networks.
4. Click Add and select Manually create a network profile.
5. Enter the SSID, select the type of security, and enter the wireless password in the
Security Key/Passphrase field.
6. Check the Start this connection Automatically and Connect even if the network is not
broadcasting checkboxes.
7. Click Next and close the window.
8. Go to the Network and Sharing Center and select Manage network connections.
9. Right-click Wireless network connection and select Status.
10. Click details and check the IPv4 address.
11. If there is a valid IPv4 address, check whether the computer can access the Internet
wireless.