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did you try to revert back? 
I have not looked at what has been changed, but you are a few versions behind OS. I would also check with the IRC and see if anyone has some pointers. 

Remo 
> On Sep 6, 2016, at 02:49, Davide Panarese <dpanarese at enter.eu> wrote:
> 
> Hi all,
> we run Openstack Juno (2014.2.4) on HA configuration.
> 
> After we have updated RabbitMQ to last release (3.6.5) we have had huge problems with ceilometer, neutron and nova. RabbitMQ shows thousand unacked messages on the most used queues, specially metering, conductor and q-plugin. 
> 
> Most popular logs are:
> ERROR oslo_messaging._drivers.impl_rabbit [-] Failed to consume message from queue: Received 0x74 while expecting 0xce
>  
> or 
> 
> 2016-09-02 04:16:17.978 20223 TRACE root OverflowError: signed integer is greater than maximum
> 2016-09-02 04:16:17.978 20223 TRACE root
> 2016-09-02 04:16:18.991 20223 ERROR oslo_messaging._drivers.impl_rabbit [-] Failed to consume message from queue: signed integer is greater than maximum
> 2016-09-02 04:16:50.418 20223 ERROR oslo_messaging._drivers.impl_rabbit [-] AMQP server 10.16.24.100:5672 closed the connection. Check login credentials: Socket closed
> 
> Anyone have this problem with RabbitMQ and Juno release?
> 
> Thanks
> Davide
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