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It can happen because of multiple reasons few of them are enlisted below.

  1. Incorrect IP/hostname/password in configuration files in neutron.conf or nova.conf across compute, controller and network node acn cause this. It was the problem statement in my scenario. I corrected it and it worked pretty well after that.
  2. Ensure neutron-linux-bridge service is up and running on controller and neutron node.
  3. Ensure basic entries in etc/hosts files are correct across nodes.
  4. Ensure relevant ports are open in IP tables.