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This error means ODL Mechanism driver in ODL was unable to create network in ODL. This can be for several factors:

  1. Neutron unable to reach ODL - Common reason could be network issue, proxy or ODL IP not configured correctly in ml2_conf.ini
  2. Exception in Neutron Northbound in ODL - check the logs in ODL for any exceptions.
  3. Authorization error - Check user/pass specified in ml2_conf.ini in Neutron.

For starter, I'd recommend taking a wireshark on tcp port 8080 on Neutron server and see if you're getting any response from ODL and if yes what the response is. 401 would be auth error while 500 would suggest some exception in ODL. No response would mean ODL isn't running or wrong IP configured.