I have a ASA 5510 firewall and setup IPSec remote desktop VPN. It works fine if I use local user for authentication. If I set AAA RADIUS authentication, it doesn't work. I did test via ASDM and error message says "authentication server not responding: no error".
I have Radius server(2008R2) installed inside network and set firewall IP as RADIUS client.
Could you advise what I missed? And how to test RADIUS server is working fine?
Server is AD/DNS and working fine but not sure how to test RADIUS function.
My only issue is VPN client doesn't work if I set RADIUS authentication.