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Good day!

I have a pix 501 that works like a charm with my pppoe (pap auth). I
have a second pix 501 that worked up until a couple days ago. Now it
won't authenticate properly with my isp. I know the username and
password are entered correctly. I know the account functions because I
can connect with my old dlink router using pppoe/pap.

Here's the debug output (brace yourself!)

----------------
....
Ver:1 Type:1 Code:09=PADI Sess:0 Len:12
Type:0101:SVCNAME-Service Name Len:0
Type:0103:HOSTUNIQ-Host Unique Tag Len:4 00000002

PPPoERcv) Dest:000f.f79f.ad1c Src:00d0.ba04.e302
Type:0x8863=PPPoE-Discovery

Ver:1 Type:1 Code:07=PADO Sess:0 Len:49
Type:0101:SVCNAME-Service Name Len:0
Type:0103:HOSTUNIQ-Host Unique Tag Len:4 00000002
Type:0102:ACNAME-AC Name Len:13 RICH-DSL-RTR2

Type:0104:ACCOOKIE-AC Cookie Len:16 FA438FB6 55065A7F 63E91FE2
0564EE68


PPPoE: PADO
send_padrSnd) Dest:00d0.ba04.e302 Src:000f.f79f.ad1c
Type:0x8863=PPPoE-Discovery

Ver:1 Type:1 Code:19=PADR Sess:0 Len:49
Type:0101:SVCNAME-Service Name Len:0
Type:0103:HOSTUNIQ-Host Unique Tag Len:4 00000002
Type:0102:ACNAME-AC Name Len:13 RICH-DSL-RTR2

Type:0104:ACCOOKIE-AC Cookie Len:16 FA438FB6 55065A7F 63E91FE2
0564EE68


PPPoERcv) Dest:000f.f79f.ad1c Src:00d0.ba04.e302
Type:0x8863=PPPoE-Discovery

Ver:1 Type:1 Code:65=PADS Sess:31677 Len:49
Type:0101:SVCNAME-Service Name Len:0
Type:0103:HOSTUNIQ-Host Unique Tag Len:4 00000002
Type:0102:ACNAME-AC Name Len:13 RICH-DSL-RTR2

Type:0104:ACCOOKIE-AC Cookie Len:16 FA438FB6 55065A7F 63E91FE2
0564EE68


PPPoE: PADS
IN PADS from PPPoE tunnel
PPPoE: Opening PPP link and starting negotiations.
PPP virtual access open, ifc = 0

Xmit Link Control Protocol pkt, Action code is: Config Request, len is:
6
Pkt dump: 050676cbffae
LCP Option: MAGIC_NUMBER, len: 6, data: 76cbffae

L2X: l2x store session: tunnel id 0, session id 31677, hash_ix=3005
Rcvd Link Control Protocol pkt, Action code is: Config Request, len is:
14
Pkt dump: 010405d40304c0230506f77c99d6
LCP Option: Max_Rcv_Units, len: 4, data: 05d4
LCP Option: AUTHENTICATION_TYPES, len: 4, data: c023
LCP Option: MAGIC_NUMBER, len: 6, data: f77c99d6

Xmit Link Control Protocol pkt, Action code is: Config ACK, len is: 14
Pkt dump: 010405d40304c0230506f77c99d6
LCP Option: Max_Rcv_Units, len: 4, data: 05d4
LCP Option: AUTHENTICATION_TYPES, len: 4, data: c023
LCP Option: MAGIC_NUMBER, len: 6, data: f77c99d6

Rcvd Link Control Protocol pkt, Action code is: Config ACK, len is: 6
Pkt dump: 050676cbffae
LCP Option: MAGIC_NUMBER, len: 6, data: 76cbffae

Xmit Link Control Protocol pkt, Action code is: Echo Request, len is: 4
Pkt dump: 76cbffae

PPP pap recv authen nak: 41757468656e7469636174696f6e206661696c6564
PPP PAP authentication failed
PPPoERcv) Dest:000f.f79f.ad1c Src:00d0.ba04.e302
Type:0x8863=PPPoE-Discovery

Ver:1 Type:1 Code:A7=PADT Sess:31677 Len:0

PPPoE: PADT
PPP va close, device = 1

Xmit Link Control Protocol pkt, Action code is: Termination Request,
len is: 0

PPPoE: Shutting down client session
---------------------------


after which sh vpdn will output:

Tunnel id 0
time since change 255 secs
Remote MAC Address 000:BA:04:E3:02
65 packets sent, 39 received, 728 bytes sent, 1794 received
termination info:
Peer Terminated
Authentication failed
LCP down
Remote MAC is 000:BA:04:E3:02
Session state is SESSION_SHUTDOWN
Time since event change 1393 secs, interface outside
65 packets sent, 0 received, 728 bytes sent, 0 received
termination info:
Peer Terminated
Authentication failed
LCP down
----------------------

Any help would be appreciated!!