the bug (and reason, and possibile resolution): kppp doesn't connect if 'auth' is set in the /etc/ppp/option. These are the errors: Dec 23 13:05:35 [pppd] The remote system is required to authenticate itself Dec 23 13:05:35 [pppd] but I couldn't find any suitable secret (password) for it to use to do so. Dec 23 13:05:35 [pppd] (None of the available passwords would let it use an IP address.) This is a default in some distro, the option 'noauth' should be given to the specific peer. Solutions: give noauth to every connection created with kppp, OR do a chech 'auth' in the dialog setup REPRODUCIBLE: Always Version of the software: 2.1.2-any, kde 3.1.4 Step to reproduce: Above notes should be sufficient I think this bug should be sent to the kde upstream. Yes, my english is evil too...
They're not going to fix this as its a part of their FAQ on the kppp site. http://devel-home.kde.org/~kppp/faq.html
so this is an upstream bug, which most likely will no be fixed