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Hi Adam.

> On 16 Mar 2015, at 20:52, Adam Lawson <alawson at aqorn.com> wrote:
> 
> Got a strange error and I'm really hoping to get some help with it since it has be scratching my head.
> 
> When I create a VM within Horizon and select the PRIVATE network, it boots up great.
> When I attempt to create a VM within Horizon and include the PUBLIC network (either by itself or with the private network), it fails with a "No valid host found" error.

Just a guess but... It sounds like you’re trying to attach an instance’s network interface directly to your external (‘public’) network which you won’t be able to do, looking at your configuration - i.e assuming your public network is one that’s been created with '--router:external True'.  However, I’m guessing that you’re launching an instance as an administrator within that project, which means that nova-scheduler will let you try to do it, but it’ll ultimately fail when neutron refuses to bind an interface to that public network segment - which would explain the errors you’re seeing.

— 

-Nick



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