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how to troubleshoot instance generating status error

I have installed icehouse openstack on ubuntu 14.04 server. I have create 3 seperate nodes. one for controller running keystone, image service, nova controller service and neutron controller service with dashboard service. Second for compute and third for network node.

I have done all the possible troubleshooting with the help of already available online help and blogs and checked all the available logs, but not getting any clue.

Whenever I create a instance its status always reflects as ERROR.

I am trying to create instance from command line and dashboard but facing same issue. kindly help.

all the nodes are able to communicate with each other with ip and hostname.

controller has one management interface while compute node and network node has additional interface for instance tunnel which are accessible from both the nodes.

kindly help to troubleshoot the issue.