Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 

Wireless client is unable to authenticate to the access point.

Core Issue

The client adapter may have issues with the security and encryption settings.

Resolution

If your client adapter is unable to authenticate to an access point. You may be receiving error messages such as %DOT11-7-AUTH_FAILED and/or possibly others. Check the security settings of your client adapter and the access point. These include the following areas:

  • Client Name or Logon Name parameter
  • WEP key values, WEP key sizes, WEP activation, and WEP transmit key parameters Network Security parameter
  • LEAP activation and LEAP username and password parameters

For more information, refer to the Problems Authenticating to the Access Point section of Troubleshooting .

Note: When considering security solutions, network administrators should refer to the 802.11 Wireless LAN Security White Paper.

Special attention should be paid to the use of strong passwords. Cisco LEAP is a password-based algorithm. To minimize the possibility of a successful dictionary attack, use strong passwords, which are difficult to guess. Some characteristics of strong passwords include the following:

  • A minimum of ten characters.
  • A mixture of uppercase and lowercase letters.
  • At least one numeric character or one non-alphanumeric character (example: !#@$%).
  • No form of the user's name or user ID.
  • A word that is not found in the dictionary (domestic or foreign).

Problem Type

Client / Device cannot authenticate

Products

Access point

WLAN adapters (wireless card) / ACU (Aironet Client Utility)

Security Options

PEAP

WEP key

EAP

LEAP / RADIUS

What can you ping?

Cannot ping peer

VxWorks Errors, Warnings, Statistics and Log Messages

Station [hostname][MAC address] Failed Authentication, status Unsupported Authentication Algorithm

Wireless Stages

Unauthenticated and Associated

Version history
Revision #:
1 of 1
Last update:
‎06-22-2009 05:38 PM
Updated by: