Comment 18 for bug 151867

I've got a /usr/share/services/knetworkmanager_pptp.desktop with the contents listed below. However, changing the service name to pptp as described on the message you linked, did not help. May be there are some settings missing or some of them need to be changed.

[Desktop Entry]
Encoding=UTF-8
Type=Service
Icon=
ServiceTypes=KNetworkManager/VPNPlugin
X-KDE-Library=knetworkmanager_vpnc
X-NetworkManager-Services=vpnc
X-KDE-PluginInfo-Author=Helmut Schaa
<email address hidden>
X-KDE-PluginInfo-Name=knetworkmanager_vpnc
X-KDE-PluginInfo-Version=0.1
X-KDE-PluginInfo-Website=
X-KDE-PluginInfo-Category=VPNService
X-KDE-PluginInfo-Depends=
X-KDE-PluginInfo-License=GPL
X-KDE-PluginInfo-EnabledByDefault=false
Name=VPNC
Name[bn]=ভপএনস
Name[xx]=xxVPNCxx
Comment=VPNC
Comment[bn]=ভপএনস
Comment[xx]=xxVPNCxx

X-Ubuntu-Gettext-Domain=desktop_knetworkmanager