I followed the tutorial and did everything as described here: _pptpclient.sourceforge.net/howto-fedora-core-3.phtml_
But I still get this error:
Using interface ppp0pptpconfig: monitoring interface ppp0
Connect: ppp0 <--> /dev/pts/4
Remote message: Welcome^M^J
PAP authentication succeeded
MPPE required, but MS-CHAP[v2] auth not performed.
pptpconfig: pppd process terminated by signal 10 (failed)