topic Cisco ISE- Invalid response was received from the Serve - Code 502 in Network Access Control

Cisco ISE- Invalid response was received from the Serve - Code 502

Hetch — Tue, 04 Jun 2024 08:35:11 GMT

Hello all, I receive the below error in ISE when trying to test aaa radius authentication on Cisco switch acting as authenticator. below is the test and error snapshots

Re: Cisco ISE- Invalid response was received from the Serve - Code 502

Mark Elsen — Tue, 04 Jun 2024 09:28:38 GMT

- Initially from the first screen it seems that there are not any radius server's defined in the group 'radius' ; that being said and to make things clear and or avoid possible confusing on the switch I would advise to give the group another name then just 'radius' ; such as for instance authserversgroup , then change the running config accordingly.

Re: Cisco ISE- Invalid response was received from the Serve - Code 502

Hetch — Tue, 04 Jun 2024 10:13:44 GMT

Thanks for your reply.

actually, the aaa config is being pushed by Cisco DNA center to the switch, so I assume config should be fine.

I did another test and intentionally typed wrong password. I got a rejection from the ISE server:

The error message appears when trying to authenticate with correct credentials. switch loses response with the ISE server for a period of time then everything restored again!

Re: Cisco ISE- Invalid response was received from the Serve - Code 502

Mark Elsen — Tue, 04 Jun 2024 10:57:40 GMT

- Returning to the your initial screenshot I see :
%RADIUS-3-NOSERVERS: No radius hosts configured....

I still find this strange ; verify with show run | inc radius

Re: Cisco ISE- Invalid response was received from the Serve - Code 502

Hetch — Tue, 04 Jun 2024 16:21:19 GMT

Hi,

This is the radius configuration:

Re: Cisco ISE- Invalid response was received from the Serve - Code 502

Mark Elsen — Tue, 04 Jun 2024 17:02:08 GMT

- I can't see any real and or effective definitions of radius servers in there ; check for instance ,
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/sec_usr_rad/configuration/15-mt/sec-usr-rad-15-mt-book/sec-cfg-radius.html#GUID-30DFE6E1-876D-4C3D-AB45-0647D89A6AEA