Hello,

The port 5000 for identity API seems a "common use" for Openstack (https://docs.openstack.org/mitaka/config-reference/firewalls-default-ports.html (mitaka docs)).

On Openstack Dashboard, in admin > system > system information, the keystone - identityURL is displayed => http://x.x.x.x/identity

Currently with last https://docs.openstack.org/devstack/latest/ (Openstack - devstack), you can retrieve a token with (using demo account):

curl --request POST --include --header "Content-Type: application/json" \
     --data '{"auth":{"identity":{"methods":["password"],"password":{"user":{"name":"demo","domain":{"name":"default"},"password":"theCorrectPassword"}}},"scope":{"project":{"name":"demo","domain":{"name":"default"}}}}}' \
     https://theOpenstackUrl/identity/v3/auth/tokens

--> HTTP/1.1 201 Created

Best regards