problem with radius authentication

gchak
New here

problem with radius authentication

Hello,

 

We've got an SSID which use the radius authentication. 

When I try an authentication via the AP I've got this error message "failed to connect to the RADIUS server".

I run a packet capture on the radius server and on the wired AP, and I see that the AP communicate with the radius but it block on the access challenge id=2.

See below please:

On the AP:

gchak_0-1642519195765.png

On the radius server:

gchak_1-1642519349331.png

It seems that the AP don't received the "access-challenge id=2".

 

Have you experienced this issue ? How to resolve ? 

 

Thank you for your help!

 

Regards

8 REPLIES 8
ww
Kind of a big deal
Kind of a big deal

Did you capture on the switchport to the ap? or other devices in the path if that packet is still present

PhilipDAth
Kind of a big deal

My first guess is that the RADIUS server is not configured to accept MSCHAPv2.

PhilipDAth
Kind of a big deal

What does the RADIUS server log say?

BlakeRichardson
Kind of a big deal

Have you confirmed the shared secret is correct? 

Meraki CMNO, Ruckus WISE, Sonicwall CSSA, Allied Telesis CASE & CAI

I'm 50% confident you won't get an Access-Reject if the shared secret is wrong.  You generally get no response at all.

KarstenI
Kind of a big deal

just go to 100% (RFC2865):

 

Once the RADIUS server receives the request, it validates the sending
   client.  A request from a client for which the RADIUS server does not
   have a shared secret MUST be silently discarded.  If the client is
   valid, ...

 

KarstenI
Kind of a big deal

The relevant part will likely be inside the second Access-Reques/Access-Chalenge. There the Client and RADIUS-Server talk about the EAP-Method to use. 

Inderdeep
Kind of a big deal

@gchak : Review this if it helps 

https://documentation.meraki.com/MR/MR_Splash_Page/RADIUS_Failover_and_Retry_Details

 

Regards
Inderdeep Singh
www.thenetworkdna.com ( Awarded by Cisco IT Blogs award 2020)
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