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My guess is that you're timing out because it's getting all security groups for all tenants.
Try listing it with the CLI client to see how long it would take.
I've seen similar issues with other tabs, like the grizzly horizon tab for images was also getting all cinder snapshots, so that page was slow.
But, thankfully, you can upgrade horizon independent of the rest of your installation, so you could pretty easily go to Havana or Icehouse horizon on your Grizzly site.

> On Mar 12, 2015, at 8:45 AM, Muthulakshmi S <smuthu712 at gmail.com> wrote:
> 
> We have Grizzly environment and see slow response from Horizon. Though we can atleast browse all the pages (Instance, Volumes, Images & Snapshots and Access & Security) as a tenant user (though its slow), however in Admin project, we can load all pages except "Access & Security".
> 
> In Admin project, the pages shows loading and then eventually times out while trying to access "Access & Security", other tabs works fine though.
> 
> nova, keystone and quantum cli commands as works fine for Admin, only EC2 gives time out.
> 
> We have enabled offline compression and set debug to false in openstack-dashboard/local_settings.py
> DEBUG = False
> COMPRESS_OFFLINE = True
> 
> Can you please suggest what else could be the issue ?
> 
> Thanks !!!
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> OpenStack-operators at lists.openstack.org
> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-operators

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