The validation of messages through the test plan executed is not working

http://sake.irisa.fr/XDStarClient/testplan/testPlanInstance.seam?id=7

Click on the button validate as in the attachment

You get this log
2017-11-15 16:27:15,602 INFO (aboufahj) [org.apache.axis2.transport.http.impl.httpclient3.HTTPSenderImpl] (http-/0.0.0.0:8180-10 /ping.seam?viewId=%2Fusers%2Flogin%2Flogin.xhtml&viewState=8937573246484920030%3A8727417120512553129&now=1510755623801&offset=-60) Unable to sendViaPost to url[http://jumbo.irisa.fr:8080/SchematronValidator-SchematronValidator-ejb/GazelleObjectValidatorWS?wsdl]: java.net.ConnectException: Connection refused (Connection refused)
at java.net.PlainSocketImpl.socketConnect(Native Method) [rt.jar:1.7.0_151]
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339) [rt.jar:1.7.0_151]
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200) [rt.jar:1.7.0_151]
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182) [rt.jar:1.7.0_151]
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) [rt.jar:1.7.0_151]
at java.net.Socket.connect(Socket.java:580) [rt.jar:1.7.0_151]
at sun.reflect.GeneratedMethodAccessor654.invoke(Unknown Source) [:1.7.0_151]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [rt.jar:1.7.0_151]