NixOS/nixpkgs — pull request #1582 by ttuegel (2014-01-24 15:25:55+00:00)
Title: networkmanager: load modules required for PPTP

Most PPTP VPN connections require the `ppp_mppe` module to be loaded. Without the module, the connection will fail producing no error message. It is much friendlier to users to load the module automatically when NetworkManager is enabled.