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Fuel 7.0 network verification failed

I am trying to deploy an OpenStack environment in my intranet with Mirantis OpenStack 7.0 Fuel.

I have three nodes and assigned "CONTROLLER","CINDER-VMWARE" and "BASE-OS" role to each node with Fuel UI's "Nodes" tab. Then, when I run "Verify Networks" on "Networks" tab, I see following error;

Verification failed.
These nodes: "1", "2", "6" failed to connect to some of these repositories: "", "" Repo availability verification using public network failed on following nodes Untitled (b4:42), Untitled (f0:b4), Untitled (52:57). Following repos are not available -, . Check your public network settings and availability of the repositories from public network. Please examine nailgun and astute logs for additional details.

I am aware I need to use a proxy server so that my environment in intranet can access external repository server on Internet. I confirmed that I can access external repositories such as "" (via a http proxy on my intranet) from public network ( for my OpenStack environment.

As for http proxy, I configured it as follows at "Bootstrap Image"-"HTTP proxy" of Fuel setup.

http://<proxy user-id>:<password>@<proxy ip-address>:<proxy port>

(Each parameter such as user-id is verified to be valid and to work)

I appreciate it if I can get any hint/clue for resolving my above trouble.