[Users] Cannot upload iso

Hello, I am using ovirt 3.1 I do: engine-iso-uploader -v -i ISO list and I get: Please provide the REST API password for the admin@internal oVirt Engine user (CTRL+D to abort): I insert correct password but I get: ERROR: [ERROR]::ca_file (CA certificate) must be specified for SSL connection. INFO: Use the -h option to see usage. I do not want to use certificates, only passwords. And, in my setup, uploading an ISO is not a security breach. What can I do? Thanks, Mario