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Troubleshooting wireless connectivity: Step 10

25 Sep 2006 | SearchNetworking.com

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If RADIUS is flowing but access requests are being rejected, you may have an 802.1X Extensible Authentication Protocol (EAP) mismatch or credential problem. Fixing this depends on EAP Type. For example, if the RADIUS server requires EAP-TLS, then select "Smart Card or other Certificate" on the wireless adapter's Network Properties / Authentication panel. If the RADIUS server requires PEAP, then select "Protected EAP" for the adapter. If the RADIUS server requires EAP-TTLS, then you'll need a third-party wireless client like AEGIS or Odyssey. Make sure that EAP-specific properties match for the adapter and server, including server certificate Trusted Root Authority, server domain name (optional but must match when specified), and client authentication method (e.g., EAP-MSCHAPv2, EAP-GTC). When using PEAP, use the CHAP "Configure" panel to prevent Windows from automatically re-using your logon. If you still haven't spotted the problem, consult the RADIUS server's 802.1X documentation for EAP-specific configuration details.

Troubleshooting wireless connectivity

Step 1: Recheck physical connections
Step 2: Verify wireless adapter connection
Step 3: Verify router's LAN port activity
Step 4: Check wireless adapter's IP address
Step 5: Verify reachability
Step 6: Check firewall connection
Step 7: Verify that the adapter is associating with the wireless router
Step 8: Find and fix a wireless security parameter mismatch
Step 9: Debug 802.1X
Step 10: Fix an 802.1X EAP mismatch or credential problem
Step 11: RF interference and roaming

About the author
Lisa Phifer is vice president of Core Competence Inc., a consulting firm specializing in network security and management technology. Lisa has been involved in the design, implementation and evaluation of data communications, internetworking, security and network management products for nearly 20 years. She teaches about wireless LANs and virtual private networking at industry conferences and has written extensively about network infrastructure and security technologies for numerous publications. She is also a site expert to SearchMobileComputing.com and SearchNetworking.com.

This tip originally appeared on SearchNetworking.com.

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