Connection Problems

When clients cannot connect to the WLAN, it is often difficult to find the problem, whether the problem affects one client or the entire site. Table 14-1 lists some common scenarios and resources to check so your WLAN runs optimally.

Table 14-1. WLAN Connectivity Issue Scenarios

Problem	Probable Cause(s)	Resolution
A single client cannot connect to the WLAN.	Computer misconfiguration or problem with user or computer account. Defective client card.	Check the computer account. Check the user account. Check the client computer. Verify security credentials. Check the client card.
Multiple clients at a single site cannot connect to the WLAN.	Misconfigured AP. Defective AP. Defective antenna.	Check AP configuration. Check to ensure the AP is working. Check the antenna to ensure it is functional.
An entire site is unable to connect to the WLAN.	Misconfigured RADIUS server.	Check the RADIUS server's configuration Check the AP's configuration as it relates to RADIUS functions.
No client at any site can connect.	Organization-wide configuration issue.	Check network directory services (such as Microsoft Active Directory). Check the RADIUS server(s).