The request to a streamed secure conversation web service gets corrupted if the service (.NET WCF) is configured as stateless (with a stateful token carrying the state in soap cookies). If the service as configured as stateful (no soap cookies), the request is valid.
Updated 2nd time: When the request is streamed, CXF doesn't stream the payload of the content of the token cookie, and the reference from the cookie is "unresolved". When the request is not-streamed, the cookie payload is included as base64 inside the cookie element, and everything works fine. The attached formatted requests EcBad.txt (failing from CXF) and EcGood.txt (valid request from a .NET WCF client) show the issue.