You map the Splunk fields to the CEF fields, anything that isn't mapped to a CEF field (either manually via "cef_field_map" or automatically in ceftool.py) won't be in the CEF event.
The RTO app shows the fields that Splunk found during the search on the left and the CEF fields defined in ceftool.py on the right. I modified my ceftool.py to contain every CEF field that is defined in the CEF standard, since ceftool.py is missing a large number of them. I also mapped CIM standard fields to the majority of the CEF fields.
I believe that means that it is unable to resolve the hostname that you are using, though there are many reasons for gaierror to be thrown. Something is causing the socket to be unable to connect. Wrong port, wrong address, wrong permissions, could be many things.
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