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I assume you are on ubuntu you can check /etc/init.d/rabbit or use rabbitmqcli start 

Remo 
> On Mar 25, 2016, at 11:20, aa asd <i_atif7 at yahoo.com> wrote:
> 
> After diagnosing the problem, it seems that rabbitmq service is not running. 
> What steps I perform to activate this service. 
> 
> A.
> 
> 
> On Friday, 25 March 2016, 22:55, Scott Lowe <scott.lowe at scottlowe.org> wrote:
> 
> 
> Please see my responses inline, prefixed by [SL].
> 
> 
> > On Mar 25, 2016, at 11:34 AM, aa asd <i_atif7 at yahoo.com <mailto:i_atif7 at yahoo.com>> wrote:
> > 
> > neutron net-create creates an following error:-
> > 
> > ERROR oslo_messaging._drivers.impl_rabbit [-] AMQP server on controller:5672 is unreachable: [Errno 111] ECONNREFUSED. Trying again in 2 seconds.
> 
> 
> [SL] It sounds to me that the system where neutron-server is running can't reach the RabbitMQ server. I would a) verify connectivity between the 2 systems; b) verify name resolution is working as expected; c) verify that no firewalls (host-based or network-based) are blocking the traffic; d) verify that the RabbitMQ service is actually running and listening on the expected systems/ports.
> 
> 
> 
> 
> > On Friday, 25 March 2016, 8:58, Remo Mattei <remo at italy1.com <mailto:remo at italy1.com>> wrote:
> > 
> > 
> > this is what I used on my test env….
> > 
> > neutron net-create external --router:external=True --provider:network_type flat --provider:physical_network physnet1
> > 
> > everyone should see the outside network by default so you need to create a router from the tenant side and add a gateway then they can go out. 
> > 
> > Let me know if this works for you.. 
> >> On Mar 25, 2016, at 08:40, aa asd <i_atif7 at yahoo.com <mailto:i_atif7 at yahoo.com>> wrote:
> >> 
> >> Hi All!
> >> I am confguring 3-node icehouse on ubuntu 15.04. All were went fine. After configured neutron on contoller, when I execute the following command:-
> >> 
> >> neutron net-create ext-net --shared --router:external=True
> >> 
> >> it creates the following error on neutron (/var/log/neutron/neutron.log)
> >> 
> >> ERROR oslo_messaging._drivers.impl_rabbit [-] AMQP server on controller:5672 is unreachable: [Errno 111] ECONNREFUSED. Trying again in 2 seconds.
> >> 
> >> Suggestions are welcome.
> 
> 
> 
> -- 
> Scott
> 
> 
> 
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