How to use SOA-P 5 ServiceInvoker in EAP 6

Issue

• We are facing an issue trying to call a service deployed on SOA-P 5.3 from a remote EAP6.
• We have followed the ESB Programmer's Guide on how to configure a remote ServiceInvoker. Both the jars listed and the configuration files are correctly included in our classpath.
• However, when we try to make the invocation it results in a SocketTimeoutException like below:

org.jboss.soa.esb.listeners.message.MessageDeliverException: org.apache.ws.scout.transport.TransportException: javax.naming.CommunicationException: Receive timed out [Root exception is java.net.SocketTimeoutException: Receive timed out]
    at org.jboss.soa.esb.client.ServiceInvoker.loadServiceClusterInfo(ServiceInvoker.java:580)
    at org.jboss.soa.esb.client.ServiceInvoker.<init>(ServiceInvoker.java:176)
    at org.jboss.soa.esb.client.ServiceInvoker.<init>(ServiceInvoker.java:157)
    at org.jboss.soa.esb.client.ServiceInvoker.<init>(ServiceInvoker.java:199)
    at com.mycompany.servlet.CallServInvoker.service(CallServInvoker.java:68)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:847)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:329)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:275)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:161)
    at org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:153)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:155)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:368)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:877)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:679)
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:931)
    at java.lang.Thread.run(Thread.java:662)
Caused by: org.jboss.soa.esb.services.registry.RegistryException: org.apache.ws.scout.transport.TransportException: javax.naming.CommunicationException: Receive timed out [Root exception is java.net.SocketTimeoutException: Receive timed out]
    at org.jboss.internal.soa.esb.services.registry.JAXRRegistryImpl.findEPRs(JAXRRegistryImpl.java:358)
    at org.jboss.internal.soa.esb.services.registry.InVMRegistryInterceptor.findEPRs(InVMRegistryInterceptor.java:85)
    at org.jboss.soa.esb.services.registry.RegistryFactory$HeadRegistryInterceptor.findEPRs(RegistryFactory.java:229)
    at org.jboss.soa.esb.listeners.RegistryUtil.getEprs(RegistryUtil.java:228)
    at org.jboss.soa.esb.client.ServiceInvoker.loadServiceClusterInfo(ServiceInvoker.java:567)
    ... 18 more
Caused by: javax.xml.registry.JAXRException: org.apache.ws.scout.transport.TransportException: javax.naming.CommunicationException: Receive timed out [Root exception is java.net.SocketTimeoutException: Receive timed out]
    at org.apache.ws.scout.registry.BusinessQueryManagerV3Impl.findConcepts(BusinessQueryManagerV3Impl.java:535)
    at org.jboss.internal.soa.esb.services.registry.JAXRRegistryImpl.getJBossESBTModel(JAXRRegistryImpl.java:795)
    at org.jboss.internal.soa.esb.services.registry.JAXRRegistryImpl.findEPRs(JAXRRegistryImpl.java:327)
    ... 22 more