With Hardy (8.04) and KVPNC from the repository I was experiencing a
similar problem.

I could get connected with our Cisco VPN, but then after a few seconds
the connection would go down and shortly after that would not reconnect
until I Quit KVPNC.

I played around with some timing and in Network/General  I noticed the
Use connection status check and that the interval was initially set to a
relatively small value (I think it was 5 or 10).  This happened to be
the same interval that I was seeing the failure from the ping being sent
out

After turning on level 3 logging I noticed that the failure was tied to
a "ping" message being sent out.  The message was error: Ping to IPAddr
within 1 checks every 5s has been failed!

I then kicked the interval up to 20 seconds, and I could now stay
connected for 20 seconds!  But every 20 seconds it would report failure,
drop the connection and reconnect.  But in this case it appeared that it
did not get into the state where I would have to quit KVPNC and restart
it in order to connect again.

For good measure I changed the interval to 40 seconds, and now every 40
seconds it reports the Ping failure, drops the connection and
reconnects.

So, next I disabled the connection status check to test and see what
would happen.

Now the connection has been up for over 42 Minutes (not seconds) and as
far as I can see the connection is still fine and dandy.  I can function
via ssh and also a fish:// session in Konqueror for browsing and copying
files.

Has anyone seen this problem (with the Ping used to do the connection
status check failing), and if so did you find a solution to the problem?
If not, and you are having regular drops of the connection you might
want to try disabling the connection status check and see if that makes
a difference.

Of course I would like to have the connection status check working, but
disabling the connection status check at least appears to allow me to
use KVPNC to access my work network for the moment.

I should also note that I have had this problem with Kubuntu 7.04 before
but never had the time to ferret out what might be going on, and I had a
build of the Cisco Linux VPN client that I could use on 7.04.

-- 
vpnc dead peer detection disconnects immediately
https://bugs.launchpad.net/bugs/93413
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