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Cisco Aironet 340, 350, and CB20A Wireless LAN Client Adapters Installation and Configuration Guide for Windows
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Chapter 10 Troubleshooting
Troubleshooting the Client Adapter
Problems Associating to an Access Point
Follow the instructions below if your client adapter fails to associate to an access point.
•
If possible, move your workstation a few feet closer to an access point and try again.
•
Make sure that the client adapter is securely inserted in your computer’s client adapter slot.
•
If you are using a PCI client adapter, make sure that the antenna is securely attached.
•
Make sure that the access point is turned on and operating.
•
Check that all parameters are set properly for both the client adapter and the access point. These
include the SSID, EAP authentication, WEP activation, network type, channel, etc.
•
Follow the instructions in the previous section to resolve any resource conflicts. If you are using
Windows NT, you may also want to try disabling the Ethernet port.
•
If the client adapter still fails to establish contact, refer to the
“Obtaining Technical Assistance”
section in the Preface for technical support information.
Problems Authenticating to an Access Point
If your client adapter is a 40-bit card and LEAP or EAP is enabled, the adapter can associate but not
authenticate to access points using 128-bit encryption. To authenticate to an access point using 128-bit
encryption, you have two options:
•
Purchase a 128-bit client adapter. This is the most secure option.
•
Disable static WEP for the client adapter and configure the adapter and the access point to associate
to mixed cells. This option presents a security risk because your data is not encrypted as it is sent
over the RF network.
Problems Connecting to the Network
After you have installed the appropriate firmware, driver, client utilities, and security modules, contact
your IS department if you have a problem connecting to the network. Proxy server, network protocols,
and further authentication information might be needed to connect to the network.
Prioritizing Network Connections (Windows 2000 and XP Only)
If your computer is running Windows 2000 or XP and more than one network adapter is enabled (such
as a Cisco Aironet client adapter and an Ethernet card), you can select which one to use by assigning a
priority to your network connections.
Note
This procedure does not apply to Windows 98, 98 SE, NT, and Me because these operating systems allow
only one network adapter to be enabled at a time.
