在向WSDL发送请求时，SOAP中的连接被拒绝错误

Question

   org.apache.axis.client.Call _call = createCall();
            _call.setUsername("nehalp");
            _call.setPassword("sap@123");
            _call.setOperation(_operations[0]);
            _call.setUseSOAPAction(true);
            _call.setSOAPActionURI("http://sap.com/xi/WebService/soap1.1");
            _call.setEncodingStyle(null);
            _call.setProperty(org.apache.axis.client.Call.SEND_TYPE_ATTR, Boolean.FALSE);
            _call.setProperty(org.apache.axis.AxisEngine.PROP_DOMULTIREFS, Boolean.FALSE);
            _call.setSOAPVersion(org.apache.axis.soap.SOAPConstants.SOAP11_CONSTANTS);
            _call.setOperationName(new javax.xml.namespace.QName("", "Unlock"));


            setRequestHeaders(_call);
            setUsername("nehalp");
            setPassword("sap@123");
            setAttachments(_call);
     try {        java.lang.Object _resp = _call.invoke(new java.lang.Object[] {unlock_Request_MT}); 

此行抛出异常：java.net.ConnectException：连接被拒绝：连接