The VPN helper for NetworkManager exists to simplify connecting to a
PPTP server using the "pptp-linux" command line client.  If you can't
connect with the pptp command, then you will never be able to connect
with NetworkManager.  Short of pointing to a guide that suggests how you
can test with the command line client, I am not able to diagnose
everyone's problems with the pptp client - there are dozens of reasons
why you might not be able to connect, starting with some device between
your PC and the VPN server that is filtering the GRE protocol, which
PPTP uses.

And no, it should not be of higher importance.  As far as I can see, the
problem isn't even with NetworkManager.   This problem doesn't happen
for everyone.  A commenter on Bug 85395 suggests "With Feisty and new
NetworkManager connecting to MS-CHAP authenticated network work smoothly
as Scottish on a rainy day."  It works fine for me on my test machines.
Also, unsupported software in the Universe repository isn't ever going
to stop the main distribution from releasing, and the component hadn't
been updated since Edgy.

There are a large set of diagnostic procedures on
http://pptpclient.sourceforge.net/howto-diagnosis.phtml#lcp_timeout
which you will have to follow *on your machine* for me to be able to
tell anything more - like I say, it works on mine.  I believe there is a
'debugging' box in the properties, which is at least a good start.

If you have this problem and have the technical ability to be able to
set up an old fashioned command-line PPTP connection, please comment.
At this point I suspect you will have the same problem as you do with
NM, which means the problem isn't in the NM plugin.  Sure, debugging
could be easier, but this is a reasonably hard problem.

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Cannot connect
https://bugs.launchpad.net/bugs/87870
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