~$ service network-manager restart
stop: Rejected send message, 1 matched rules; type="method_call", sender=":1.77" (uid=1000 pid=10033 comm="stop network-manager ") interface="com.ubuntu.Upstart0_6.Job" member="Stop" error name="(unset)" requested_reply="0" destination="com.ubuntu.Upstart" (uid=0 pid=1 comm="/sbin/init")
start: Rejected send message, 1 matched rules; type="method_call", sender=":1.78" (uid=1000 pid=10030 comm="start network-manager ") interface="com.ubuntu.Upstart0_6.Job" member="Start" error name="(unset)" requested_reply="0" destination="com.ubuntu.Upstart" (uid=0 pid=1 comm="/sbin/init")
Any hints? The common network problem in Ubuntu 12.04 with hang up within a couple of minutes.
With sudo I can restart the network-manager but it doesn't have effect to the connection.