Dialup connections between Cisco Router and XP (PPP)

[reimesch62]

Hello @all,
i have a problem with a cisco Dialon Demand configuration.

our customer have some watertank to controll. on the centralside we have an Cisco 2821 Router with 1 PRI Interface. at the Watertanks are win/nt or win/xp workstation installed. So the PC´s on the tankside have make connection´s the the Centrallside for send Controllinformation´s . The Centralside make connection to the tank for sending command to the tanks.

Ok now my problem. The NT workstations are working fine.
The XP Workstations can send her Controllinformation to the centralside, but i cant build a connection from the cisco to the tanks with XP workstation. PPP authention failed.
In the Systemprotokoll of the workstation´s are entrys "user xxx not autheticated timout authentication
this is a sample confiuration of a Dialer interface

interface Dialer28
ip address 192.168.28.1 255.255.255.0
encapsulation ppp
dialer pool 10
dialer remote-name IPC_28
dialer string 0XXXXXX
dialer-group 1
peer default ip address pool DIALIN
ppp authentication ms-chap ms-chap-v2 chap callin callout optional
ppp chap password 0 XXXXXX

Thanks for help