A saga: pptp não conecta!!

Caros colegas,

olhando o tutorial em http://www.dicas-l.com.br/dicas-l/20030710.php e tentando solucionar meu problema com pptp, instalei do http://pptpclient.sourceforge.net o pptp e estou tentando conectar mas nao consigo. Diferentemente do que esta mencionado no artigo, o arquivo options do pptp nao é o /etc/ppp/options e sim o /etc/ppp/options.pptp que tem o seguinte conteudo:

###############################################################################
# $Id: options.pptp,v 1.1 2005/02/18 01:40:23 quozl Exp $
#
# Sample PPTP PPP options file /etc/ppp/options.pptp
# Options used by PPP when a connection is made by a PPTP client.
# This file can be referred to by an /etc/ppp/peers file for the tunnel.
# Changes are effective on the next connection. See "man pppd".
#
# You are expected to change this file to suit your system. As
# packaged, it requires PPP 2.4.2 or later from http://ppp.samba.org/
# and the kernel MPPE module available from the CVS repository also on
# http://ppp.samba.org/, which is packaged for DKMS as kernel_ppp_mppe.
###############################################################################

# Lock the port
lock

# Authentication
# We don't need the tunnel server to authenticate itself
noauth

# We won't do EAP, CHAP, or MSCHAP, but we will accept MSCHAP-V2
refuse-eap
refuse-chap
refuse-mschap

# Compression
# Turn off compression protocols we know won't be used
nobsdcomp
nodeflate

# Encryption
# (There have been multiple versions of PPP with encryption support,
# choose with of the following sections you will use. Note that MPPE
# requires the use of MSCHAP-V2 during authentication)

# http://ppp.samba.org/ the PPP project version of PPP by Paul Mackarras
# ppp-2.4.2 or later with MPPE only, kernel module ppp_mppe.o
# {{{
# Require MPPE 128-bit encryption
require-mppe-128
# }}}

# http://polbox.com/h/hs001/ fork from PPP project by Jan Dubiec
# ppp-2.4.2 or later with MPPE and MPPC, kernel module ppp_mppe_mppc.o
# {{{
# Require MPPE 128-bit encryption
#mppe required,stateless
# }}}

Quando dou o comando pptp 10.0.0.138, aparece a mensagem:

root@Server ~# pptp 10.0.0.138
Using interface ppp0
Connect: ppp0 <--> /dev/pts/1
LCP: timeout sending Config-Requests
Connection terminated.
Using interface ppp0
Connect: ppp0 <--> /dev/pts/1
tcflush failed: Bad file descriptor
tcsetattr: Invalid argument (line 1001)

Alguem sabe o que pode ser?