Server log is stating that there is a problem with communicating via SSL. Here is the log message:
INFO [JettyLogger] The Jetty web server reported a problem when communicating via SSL, probably a REST client or internet browser was connecting via HTTP instead of HTTPS. EXCEPTION , Exception: javax.net.ssl.SSLHandshakeException, Messasge: Remote host closed connection during handshake
A blank file is downloaded when this happens as well which may be a symptom as well.