[PLUTO-help] Problema configurazione SwissVPN e Ubuntu Hardy (8.04)

[saffolino]

Salve a tutti! Ho un problema con la configurazione di un VPN su Ubuntu
Hardy(8.04).Premetto che network-manager l'ho dovuto togliere per
problemi con il wireless, perciò ho scleto di usare WICD.Per gestire
connessioni VPN uso PPTP-LINUX.Purtroppo network-manager mi poteva
agevolare nella configurazione della connessione VPN, tramite plugin
network-manager-vpnc(versione aggiornata di pptpconfig).Per fortuna non è
un problema dato che posso creare la connessione manualmente.Seguendo
l'HOW-TO sul sito ufficiale di pptp-linux, ho configurato quanto segue:
################################################
aggiunto al file /etc/ppp/chap-secrets

swissvpntest VPNSwiss swissvpntest *
################################################
modificato il file /etc/ppp/options.pptp in modo tale da supportare
l'MPPE 128bit
################################################
creato la connessione VPN /etc/ppp/VPNSwiss (nome a caso)

pty "pptp connect.swissvpn.net --nolaunchpppd"
name "swissvpntest"
remotename VPNSwiss
require-mppe-128
usepeerdns
file /etc/ppp/options.pptp
ipparam VPNSwiss
################################################

Quando provo a fare "sudo pon VPNSwiss" non si connette(controllando ocn
plog)

questo è il debug:
 sudo pon VPNSwiss debug dump logfd 2 nodetach
pppd options in effect:
debug        # (from command line)
nodetach        # (from command line)
logfd 2        # (from command line)
dump        # (from command line)
noauth        # (from /etc/ppp/options.pptp)
refuse-pap        # (from /etc/ppp/options.pptp)
refuse-chap        # (from /etc/ppp/options.pptp)
refuse-mschap        # (from /etc/ppp/options.pptp)
refuse-eap        # (from /etc/ppp/options.pptp)
name swissvpntest        # (from /etc/ppp/peers/VPNSwiss)
remotename VPNSwiss        # (from /etc/ppp/peers/VPNSwiss)
        # (from /etc/ppp/options.pptp)
pty pptp 1 connect.swissvpn.net --nolaunchpppd        # (from /etc/ppp/
peers/VPNSwiss)
crtscts        # (from /etc/ppp/options)
        # (from /etc/ppp/options)
asyncmap 0        # (from /etc/ppp/options)
lcp-echo-failure 4        # (from /etc/ppp/options)
lcp-echo-interval 30        # (from /etc/ppp/options)
hide-password        # (from /etc/ppp/options)
proxyarp        # (from /etc/ppp/options)
usepeerdns        # (from /etc/ppp/peers/VPNSwiss)
nobsdcomp        # (from /etc/ppp/options.pptp)
nodeflate        # (from /etc/ppp/options.pptp)
require-mppe-128        # (from /etc/ppp/options.pptp)
noipx        # (from /etc/ppp/options)
anon warn[pptp_gre_bind:pptp_gre.c:100]: connect: Invalid argument
anon fatal[main:pptp.c:322]: Cannot bind GRE socket, aborting.
using channel 4
Using interface ppp1
Connect: ppp1 <--> /dev/pts/2
Script pptp 1 connect.swissvpn.net --nolaunchpppd finished (pid 19910),
status = 0x1
Modem hangup
Connection terminated.
###################################################################
Come risolvo questo Cannot bind GRE socket, aborting?

Uso firestarter per la gestione del firewall, ma non credo sia lui a
bloccare la connessione dato che anche disabilitandolo non funziona.Per
connettermi uso il wireless+pppoeconf, se può essere utile questa
informazione.