issue with 3800 mobily express

[Mike Vzz]

hello experts,

I have issue with end devices  when try to connected to wireless network.

 "Mobility Express" , DESCR: "Cisco Aironet 3800 Series Mobility Express"

 ios  running 8.5.140.0

on the 3800  the logs 

*Dot1x_NW_MsgTask_0: Mar 11 11:14:05.010: %DOT1X-3-ABORT_AUTH: 1x_bauth_sm.c:487 Authentication Aborted for client xx:xx:xx:xx:xx:xx Abort Reason:DOT1X RESTARTED DUE TO EAPOL-START/CLIENT ROAM

Mon Mar 11 11:13:59 2019--RADIUS server x.x.x.x:1812 failed to respond to request (ID 204) for client xx:xx:xx:xx:xx:xx / user 'jhon.travolta@reds.com'

[Haydn Andrews]

Is this happening for all clients?

What are you seeing from the RADIUS server? Is the authentication hitting the radius server?

It looks like RADIUS is not responding to the request.