Radius client on RB450G

I want to setup radius for local login authentication for RB450G.
I read this manual: http://www.mikrotik.com/testdocs/ros/2.8/appex/user_rad.php and did it step by step.
I have Debian 6.0 Server with configured FreeRadius on it.

[admin@u195-35] /system license> print
software-id:
upgradable-to: v7.x
nlevel: 5
features:
[admin@u195-35] > system resource print
uptime: 17h39m39s
version: 5.18
free-memory: 241616KiB
total-memory: 257108KiB
cpu: MIPS 24Kc V7.4
cpu-count: 1
cpu-frequency: 680MHz
cpu-load: 1%
free-hdd-space: 482116KiB
total-hdd-space: 520192KiB
write-sect-since-reboot: 9379
write-sect-total: 43403
bad-blocks: 0%
architecture-name: mipsbe
board-name: RB450G
platform: MikroTik
[admin@u195-35] > radius print
Flags: X - disabled

SERVICE CALLED-ID DOMAIN ADDRESS SECRET

0 login 192.168.204.41 78e23K#
[admin@u195-35] > /user aaa print
use-radius: yes
accounting: yes
interim-update: 0s
default-group: read
exclude-groups:
[admin@u195-35] > /user print
Flags: X - disabled

NAME GROUP ADDRESS

0 ;;; system default user
admin full
1 user read
3 ex read

But it didn't work for me.
I successfully login via winbox or putty/ssh.
But I am not authenticated by the radius.
Even i don't see any packets on FreeRadius server by tcpdump

Does anyone have any experience on this issue?

Hi
check radius client state and see how many request send to your radius server and how many of them accepted or rejected or timeout
if you see timeout counter is not 0 you have a problem in connecting to your radius server.