I have done some research and I have end up with this: http://pptpclient.sourceforge.net/howto-diagnosis.phtml#lcp_protrej_1
According with pptpclient documentation the "unsupported protocol" error is caused by "the MPPC patch to pppd is not compatible with kernel * MPPE kernel module" Can anyone confirm if this could be the cause ? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/290178 Title: pptp vpn connection drops out To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/network-manager-pptp/+bug/290178/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs