Мда, неприятно ... Обаче видя ли в коментарите:
"After looking at the source code, I got this to work by adding a gconf setting. This setting cannot be properly set from the new network-manager-pptp UI.
I added a string type gconf key called 'refuse-eap' under the gconf path of /system/networking/connections/1/vpn and set it to 'yes'
/system/networking/connections/1/vpn/refuse-eap = "yes"
Obviously the '1' number there may be different for different users."
Изглежда е помогнало на няколко души. Успех и дано обърнат скоро внимание на проблема.