Neutron router commands show: 404 Not Found The resource could not be found.

[AJNOURI]

On the controller:
neutron router-list
or
neutron router-create "router1"
result in:

404 Not Found The resource could not be found.

Neutron log file /var/log/neutron/server.log shows:

2016-09-21 12:20:18.715 1117 ERROR neutron.openstack.common.rpc.common [-] AMQP server on controller:5672 is unreachable: [Errno 111] ECONNREFUSED. Trying again in 1 seconds. 

[AJNOURI]

Following the discussion here
(https://linuxacademy.com/community/posts/show/topic/1638-openstack-creating-your-initial-networks-neutron-routercreate-failed)
(Steve E) solution solved my issue:
On the controller node (/etc/neutron/neutron.conf):
replace the commented
#service_plugins =
with
service_plugins = neutron.services.l3_router.l3_router_plugin.L3RouterPlugin

Note that for both the network and compute node values are different from the controller value
conpute + network nodes (/etc/neutron/neutron.conf):
service_plugins = router

And make sure to check endpoints for mismatched regions, if needed delete and reconfigure the endpoint with explicit region "regionOne" as mentioned by @stephen.