I am attempting to set up a 2800 series router for dial up access. I would be using Windows XP to set up a connection, via the modem, to the router. I am able to reach the router and begin handshaking but when it goes to authenticate my user name and password, it fails. My ACS is showing the error message "Authentication type not supported by External DB." When I remove the "ppp authencation chap pap" line from the config, it connects without authenticating. I have having trouble trying to figure out exactly what the problem is and why won't it authenticate. Any help would be appreciated and let me know if you need anything else.