I was able to integrate with Sharepoint 2013 CMIS producer only by using Basic HTTP Authentication!
According to Microsoft all other authentication methods are available, but so far I wasn't able to connect using NTLM or any other.
BTW using SoapUI and running against SOAP service:
Testing soap service:
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ns="http://docs.oasis-open.org/ns/cmis/messaging/200908/"> <soapenv:Header/> <soapenv:Body> <ns:getRepositories/> </soapenv:Body> </soapenv:Envelope>
At the same time Sharepoint native web service for the same web application and site:
runs with NTLM authentication just fine.