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7206 PPPoE Customers can not get authenticated
I have a Cisco 7206 VXR that is acting as a handles the PPPoE sessions from CPE...

Version : c7200-js-mz.122-14.S

After we enable the AAA , 12hours or 1 day later customers can not get authenticated...
our configuration:

aaa authentication ppp default group radius
aaa authorization network default none
aaa accounting network default start-stop group radius

vpdn-group xxxxx
protocol pppoe
virtual-template 1
pppoe limit per-mac 500
pppoe limit per-vlan 800

interface GigabitEthernet0/1
no ip redirects
no ip mroute-cache
load-interval 30
duplex full
speed auto
media-type rj45
no negotiation auto
pppoe enable
interface GigabitEthernet0/1.15
encapsulation dot1Q 15
pppoe enable
interface GigabitEthernet0/1.16
encapsulation dot1Q 16
pppoe enable
interface GigabitEthernet0/1.17
encapsulation dot1Q 17
pppoe enable
interface Virtual-Template1
ip unnumbered Loopback0
ip mtu 1492
no ip route-cache cef
timeout absolute 720 0
peer default ip address pool adsl
ppp authentication chap pap

When the customers fail to authenticate we seen when we do : sh ppp queues

Proc #0 pid=118
authens =40713 avg=100s.
per-user=111215 avg=86 s.
preauth =0 avg=0 s.
authors =0 avg=0 s.
queue len=489 max len=2453
Vi319 CHAP_RRESPONSE (0x63EDB6F8) id=116 148s. busy/0
Vi233 AAA_PER_USER (0x64216934) LCP_DOWN 148s.
Vi379 AAA_PER_USER (0x642169A0) LCP_DOWN 148s.
Vi4 CHAP_RRESPONSE (0x63B30458) id=51 148s.
Vi86 AAA_PER_USER (0x64406778) LCP_DOWN 146s.
Vi63 AAA_PER_USER (0x63E8C124) LCP_DOWN 146s.
Vi379 AAA_PER_USER (0x63E8D8EC) LCP_DOWN 146s.
Vi101 AAA_PER_USER (0x63DA56EC) LCP_DOWN 146s.
Vi294 CHAP_RRESPONSE (0x63DA8D40) id=230 145s.
Vi86 AAA_PER_USER (0x63D739D0) LCP_DOWN 144s.
Vi274 CHAP_RRESPONSE (0x641B7DD4) id=24 144s.
Vi63 AAA_PER_USER (0x638DC5DC) LCP_DOWN 144s.
Vi101 AAA_PER_USER (0x638DC648) LCP_DOWN 144s.
Vi4 AAA_PER_USER (0x6419AA4C) LCP_DOWN 144s.
Vi55 AAA_PER_USER (0x63FBD4F4) LCP_DOWN 144s.
Vi415 CHAP_RRESPONSE (0x63AB4664) id=48 143s.
Vi410 AAA_PER_USER (0x63AB46D0) LCP_DOWN 143s.
Vi173 AAA_PER_USER (0x63C3E2AC) LCP_DOWN 143s.
Vi295 CHAP_RRESPONSE (0x63A42708) id=71 143s.
Vi249 CHAP_RRESPONSE (0x63DEDD40) id=51 142s.
Vi4 AAA_PER_USER (0x63F6F4C0) LCP_DOWN 142s.
Vi378 CHAP_RRESPONSE (0x63E167C0) id=14 142s.
Vi294 AAA_PER_USER (0x63DA7F8C) LCP_DOWN 142s.
Vi55 AAA_PER_USER (0x63F62C98) LCP_DOWN 142s.
Vi413 CHAP_RRESPONSE (0x639DF9C0) id=118 141s.
Vi410 AAA_PER_USER (0x6394A0B8) LCP_DOWN 141s.
Vi216 CHAP_RRESPONSE (0x63BFC9FC) id=31 141s.
Vi173 AAA_PER_USER (0x640857D8) LCP_DOWN 141s.

We think that the problem is not the communication between the Router and the Radius in
the Router itself....

Anybody can help......Thanks