Hi all Guys!
the problem there is no softlink at the /tmp/ppp-secrets in /etc/ppp directory.
I guess is a GUI issue.
I’m posting my own work-aroud in Pre Boot:
ln -s /tmp/ppp-secrets /etc/ppp/pap-secrets
ln -s /tmp/ppp-secrets /etc/ppp/chap-secrets
chmod 600 /etc/ppp/chap-secrets
chmod 600 /etc/ppp/pap-secrets
Byez