WSO2 ESB SimpleStockProxy => unable to sendViaPost - wso2

Question

I'm currently trying to set up SimpleStockProxy per https://docs.wso2.com/display/ESB490/Lesson+Three%3A+Mediating+Services#LessonThree:MediatingServices-ConfigSample2 and receiving the following error:
Unable to sendViaPost to url[http://localhost:8280/services/StockQuoteProxy
telnet localhost 8280
Trying ::1...
telnet: connect to address ::1: Connection refused
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
The addresses test successfully when connecting to http://localhost:9000/services/SimpleStockQuoteService. The actual SimpleQuoteService works as well.
The full config source is below:
<?xml version="1.0" encoding="UTF-8"?>
<definitions xmlns="http://ws.apache.org/ns/synapse">
<registry provider="org.wso2.carbon.mediation.registry.WSO2Registry">
<parameter name="cachableDuration">15000</parameter>
</registry>
<taskManager provider="org.wso2.carbon.mediation.ntask.NTaskTaskManager"/>
<proxy name="StockQuoteProxy" startOnLoad="true" statistics="enable"
trace="enable" transports="https http local">
<description/>
<target>
<endpoint>
<address uri="http://localhost:9000/services/SimpleStockQuoteService"/>
</endpoint>
<outSequence>
<send>
<endpoint>
<address uri="http://localhost:9000/services/SimpleStockQuoteService"/>
</endpoint>
</send>
</outSequence>
</target>
<publishWSDL uri="file:./repository/samples/resources/proxy/sample_proxy_1.wsdl"/>
</proxy>
<endpoint name="SimpleStockQuoteService">
<address statistics="enable" uri="http://localhost:9000/services/SimpleStockQuoteService"/>
</endpoint>
<sequence name="fault">
<!-- Log the message at the full log level with the ERROR_MESSAGE and the ERROR_CODE-->
<log level="full">
<property name="MESSAGE" value="Executing default 'fault' sequence"/>
<property expression="get-property('ERROR_CODE')" name="ERROR_CODE"/>
<property expression="get-property('ERROR_MESSAGE')" name="ERROR_MESSAGE"/>
</log>
<!-- Drops the messages by default if there is a fault -->
<drop/>
</sequence>
<sequence name="main">
<in>
<!-- Log all messages passing through -->
<log level="full"/>
<!-- ensure that the default configuration only sends if it is one of samples -->
<!-- Otherwise Synapse would be an open proxy by default (BAD!) -->
<filter regex="http://localhost:9000.*" source="get-property('To')">
<!-- Send the messages where they have been sent (i.e. implicit "To" EPR) -->
<send/>
</filter>
</in>
<out>
<send/>
</out>
<description>The main sequence for the message mediation</description>
</sequence>
<!-- You can add any flat sequences, endpoints, etc.. to this synapse.xml file if you do
*not* want to keep the artifacts in several files -->
</definitions>
Anyone have any ideas about what could be wrong here?