i had this same problem, but since 5 minutes ago my problem was solved by requesting a new password for my ADSL account..
my password began with $@.. and the string ($) - sign caused problems to the router.. it regognished it as a shellvariable.
try:
conn. type: pptp
username: user@adsltest
password: . (one dot)
wan ip: 10.0.0.150
subnet: 255.255.255.0
gateway: 10.0.0.0.138