We need to forward all properties in the testing.properties file to the application. I therefore added the "net" prefix to the list of prefixes that ant would pass on

build.xml

@@ -286,6 +286,7 @@
             <!-- Tell all protocol testers their account details. -->
             <syspropertyset id="accounts">
               <propertyref prefix="accounts"/>
+              <propertyref prefix="net"/>
             </syspropertyset>
         </java>