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@eng-sarro what OS U r using ? To troubleshoot connectivity I'd recommend to:

  1. Check via ping

    ping -c1 controller

  2. Check if controller is resolvable via DNS

  3. Check the firewall:

    firewall-cmd --state #RHEL based OS

    iptables -L

  4. If U ain't using HA check openstack services with

    openstack-status

  5. Check the Neutron services

    systemctl status neutron-server #RHEL based OS