Confirmed with vpnc in Karmic.  Adding "Local Port 10000" makes it work
here.

The oddest thing is "Local Port 499" works too, and so does "Local Port
501".  It looks like port 500 is specifically getting blocked.

This is running from home, through a Linksys Etherfast Cable/DSL Router,
BEFSR41 V3, to a cable connection.  The connection is through Virgin
Media in the UK.

I have checked the web configuration interface and there seems to be no
mention of port 500 anywhere.  The router does not have any IPsec or VPN
options that might be snooping that port, either.  The laptop where I am
running vpnc does not have any iptables rules, and all policies are set
to ACCEPT.

The most annoying thing about this behaviour is there's no obvious way
to add the option through NetworkManager, and NetworkManager doesn't use
the normal configuration files, so you can't use NetworkManager's VPN
controls at all.

Because these things always happen from time to time, imho
NetworkManager's GUI should offer a way to add arbitrary options or
point to a config file to pass to vpnc, for those occasions when you
need extra options that it doesn't know about.  Its "Mobile Broadband"
and "DSL" GUIs have the same problem: when you need to give extra
options to pppd for an unusual reason, there is no way to do it, or if
there is a way it's obscure.

-- 
"no response from target" with 0.4.0 up to 0.5.3 but not with 0.3.3
https://bugs.launchpad.net/bugs/122045
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