It seems to be a bad interraction with gnome-keyring-daemon somehow...
I found the following workaround :
1) stop NetworkManager and kill nm-applet
2) Launch seahorse. In the tab "Passwords" there should be an entry of the form:
VPN password secret for CONNECTIONNAME/org.freedesktop.NetworkManager.pptp/vpn
where CONNECTIONNAME is the VPN connection which is failing. Delete this entry.
restart networkmanager and nm-applet.
3) Edit the parameters of VPN CONNECTIONNAME but leave the password field blank.
4) Connect to VPN. A dialog box pops up and ask for the VPN password. Put it. The connection should work again
(at least it works for me).
It seems to be a bad interraction with gnome-keyring- daemon somehow...
I found the following workaround :
1) stop NetworkManager and kill nm-applet org.freedesktop .NetworkManager .pptp/vpn
2) Launch seahorse. In the tab "Passwords" there should be an entry of the form:
VPN password secret for CONNECTIONNAME/
where CONNECTIONNAME is the VPN connection which is failing. Delete this entry.
restart networkmanager and nm-applet.
3) Edit the parameters of VPN CONNECTIONNAME but leave the password field blank.
4) Connect to VPN. A dialog box pops up and ask for the VPN password. Put it. The connection should work again
(at least it works for me).