[pptp-server] pppd problem :o

[bao]

Hi list,
I try to run pptp, but when it gets to pppd, I receive this error
message:

/usr/sbin/pppd: The remote system is required to authenticate itself
/usr/sbin/pppd: but I couldn't find any suitable secret (password) for
it to use to do so.
/usr/sbin/pppd: (None of the available passwords would let it use an IP
address.)

I have passwords in chap-secrets, and also have tried with pap-secrets,
but there's no change.

Has anyone encountered this before ??

Many thanks to all.