1.       Have you enabled logging ? Do you see any errors in nova-network logs ?

2.       Which network manager are you using ?

3.       Some details about your setup will also help (Is it Single machine 
setup ?)

-Mandar

From: openstack-bounces+mandar.vaze=nttdata....@lists.launchpad.net 
[mailto:openstack-bounces+mandar.vaze=nttdata....@lists.launchpad.net] On 
Behalf Of ghassen ben hamida
Sent: Monday, May 07, 2012 5:49 AM
To: openstack@lists.launchpad.net
Subject: [Openstack] Instance unreachable

Hi,
I install openstack essex on ubuntu 12.04.
everything seems running correctly,
I can launch instances with nova boot command and also from the dashboard, an 
IP inside the range is assigned.
The problem is that i can't ping or ssh the instances.
I have configured the groupsecure rules to allow ping and ssh but the problem 
persist.
any idea about that please ?
thx

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