The same story with network manager. After an upgrade of Karmic, it
stopped to show the sattus of the network, while everything worked.
Problem was corrected as follows:

Status of interfaces:
$ cat /etc/network/interfaces 
auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static
address 192.168.0.234
netmask 255.255.255.0
gateway 192.168.0.1


Modified network manager config:
~$ cat /etc/NetworkManager/nm-system-settings.conf
[main]
plugins=ifupdown,keyfile
#no-auto-default=00:19:66:f7:b6:e4,      <============== modif
[ifupdown]
#managed=false
managed=true   <============== modif

Restart with /etc/init.d/network-manager restart

-- 
NetworkManager applet says "No valid active connections found!"
https://bugs.launchpad.net/bugs/305606
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