Clients Not Authenticating via 802.1x and Jumbo Frame
Clients not authenticating via 802.1x authentication.
Mac Auth works fine.
1- Show tech all logs, error : radius server not reachable and no radius server configured.
2- Request is reaching the CPPM, but TIMEOUT / REJECT with reason “Client did not complete EAP transaction”
3- In show radius, the server has * in front of the IP (sometimes), however the server is reachable.
4- On the PC the logs the error states“ network stopped answering authentication , error code 0
5- In the Wireshark, we could see, the certificate exchange, after that the EAP starts all over again.
6- Debugging in the switch will only give only Access Challenge.
Vlan Configuration :
name "Network MGMT"
ip address 10.60.11.225 255.255.255.0
Check if there is Jumbo enabled.
If yes, go ahead and disable Jumbo frame in the switch.
Somewhere in the data path, or on the server, jumbo frame support has been removed or adjusted to prevent the radius packets from reaching CPPM.
This is possibly the most likely reason. This could occur on the switch, or on the server.