Query Marmotta via SPARQL Federation?

[Paul Danckaert]

Greetings,

I have a separate server that has openrdf-based software running on it, and am 
attempting to do a SPARQL federation query over to marmotta.  I can query the 
marmotta server manually without a problem, but when I try a remote query I get 
an error.  The remote server is attempting to execute a simple query like:

SELECT * WHERE{
     {
        SERVICE <http://marmotta:8180/marmotta/sparql/select>{
            ?s ?p ?o .
        }
    }
}

And this results in a 401 response from marmotta, for example:

x.x.x.x - - [05/Mar/2015:07:54:52 -0500] "POST /marmotta/sparql/select 
HTTP/1.1" 401 -

I've tried the SPARQL service direction to just /marmotta/sparql as well, but 
according to the documentation it seems like the POST to select should work.

Note, I'm not trying to federate out from marmotta, but rather to query into it 
from an existing server.

Any thoughts on why this might be failing, or if I should be using an alternate 
endpoint?

Thanks!