I'm adding some information.

After the configuration described in my previous post, I restarted nova-api and it runs: the "ImportError" problem, that caused the service crash, disappeared.

However, after configuring the nova-api URL in keystone as described here http://docs.openstack.org/trunk/openstack-compute/install/content/keystone-service-endpoint-create.html (http://docs.openstack.org/trunk/opens...) , I submitted command

nova list

just to verify that nova-api was fine.

Actually, the request is received by the nova-api server (in fact I can see some log messages in the nova-api.log file) but at console I get the following response:

ERROR: Malformed request url (HTTP 400)

The log file messages do not help me much understand what happened.

Can anybody help me understand what's going on?

To recap:

1) I configured api.paste.ini as per the manual 2) It caused nova-api service crash 3) I changed api.paste.ini using the one released with Essex stable release 4) I configured nova endpoint URLs as defined in the manual 5) I submitted "nova list" command 5) I noted that requests reach nova-api but I don't get results, just errors

What is wrong? Maybe api.paste.ini is not really correct? It is consistent in the sense that all the mentioned pieces are there but it is not correct because the pieces do not support what nova command sends to nova-api?

Thanks for your help.