You might receive the error message below while discovering an Oracle Virtual Server:
(02/15/2014 05:57:26:942 PM) OVMAPI_4010E Attempt to send command: get_api_version to server: 192.168.78.157 failed. OVMAPI_4004E Server Failed Command: get_api_version , Status: org.apache.xmlrpc.client.XmlRpcHttpTransportException: HTTP server returned unexpected status: Unauthorized access attempt from ('192.168.78.155', 55150)! [Sat Feb 15 17:57:26 PST 2014] [Sat Feb 15 17:57:26 PST 2014]
This means that most likely your password for the agents user is incorrect. I got around this by resetting it on the Oracle Virtual Server. Thanks to Avi for posting it in the Oracle Forums!
$ ovs-agent-passwd oracle Password: Again:
Attempt to rediscover again, and it should work.