12-06-2012 12:03 PM - edited 03-10-2019 07:52 PM
We upgraded our switches recently from the 12 train to 150 train. We are now getting this error message on some clients which is forcing us to bypass authentication. Other ports are working just fine. It seems to happen most when users move there laptops to different locations.
%DOT1X-5-FAIL: Authentication failed for client (Unknown MAC) on Interface Gi0/5
88 1803.73xx.xxxx DYNAMIC Drop
notice above the MAC address is listed as DROP....
12-06-2012 03:44 PM
Could you show us the interface config for port Gi0/5 ?
12-07-2012 09:47 AM
aaa authentication dot1x default group radius
switchport access vlan 1
switchport mode host
authentication port-control auto
dot1x pae authenticator
12-07-2012 08:39 PM
How is the client supposed to be authenticated? (EAP, PEAP, etc)? Also, can you post a screen shot of the detailed screen from the live authentication screen?
12-10-2012 07:47 AM
Clients are authenticating using PEAP. I don't know what you mean by a detailed screen from live authentication screen? On the switch, we are getting this error in the logs %DOT1X-5-FAIL: Authentication failed for client (Unknown MAC) on Interface Gi0/5. We are using MS NAP for Radius. The request isn't even arriving to the NAP, as its getting denied from the Switch before it gets to NAP so there is no event results-
12-10-2012 08:38 AM
Unknown mac means the switch is not seeing any mac address on the port, but there is link, so dot1x is just running, but there is no radius request sent to your radius server.
Try to do a show mac-address-table interface x/x, and see if any macs are known on the port. If yes, try to shut/no shut the port, and see if that triggers the dot1x process.
12-11-2012 01:03 PM
debug authentication all
show authentication sessions
06-26-2015 08:17 AM
Did you ever get this resolved?
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