Comment 15 for bug 1477932

I believe I found why this was causing a problem, the network setup on the web interface was the problem for me, the default settings used a 172 address range which is fine but the problem was that it was attempting to use that range over the existing network interface. I had to add a VLAN tag to fix the problem.

I noted the following warning in the Logs of Fuel Master > WebBackend > Warning: "[7f5d9ed52740] (manager) Checking networks failed: Some untagged networks are assigned to the same physical interface. You should assign them to different physical interfaces. Affected:
"admin (PXE)", "public" networks at node"

You may want to check to see if this is the same problem that you experienced. Hope this helps.