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Frequent Contributor

Mar 10 11:47:13.566: %DOT1X-5-FAIL: Authentication failed for client (Unknown MAC) on Interface Et0/1 AuditSessionID C0A8FE6400000001001BB905

Hi Guys

Kindly , what is the cause of the below logs , 

Mar 10 11:47:13.566: %DOT1X-5-FAIL: Authentication failed for client (Unknown MAC) on Interface Et0/1 AuditSessionID C0A8FE6400000001001BB905
SW1(config-if)#end
*Mar 10 11:47:13.566: %AUTHMGR-7-RESULT: Authentication result 'no-response' from 'dot1x' for client (Unknown MAC) on Interface Et0/1 AuditSessionID C0A8FE6400000001001BB905
*Mar 10 11:47:13.566: %AUTHMGR-7-FAILOVER: Failing over from 'dot1x' for client (Unknown MAC) on Interface Et0/1 AuditSessionID C0A8FE6400000001001BB905

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Contributor

The switch is not getting a

The switch is not getting a response back from the supplicant on the client.  Is the supplicant enabled and configured on the client?  Do you have  may enabled as the next auth method?  If not your client Wil fall back to no access depending on your switch config.

We typically see a  lot of these messages when our hosts (Dell optiplex systems) where we have left the wake on lan functionality enabled and the pc is powered off.  The nic is still enabled and able to listen for magic packets to turn the pc on, but the switch doesnt have a mac to put the client into a vlan (via mab) so it will fall back to our critical vlan by default where the client can hear those magic packets.