**Denodo Platform** includes an installation of **Apache Tomcat** that is used as internal web container. By default, every time when the Virtual DataPort server starts up, the Web service embedded container is started up too.
I would check that the internal web container of the Denodo Platform is started and working. You can check it by using the** Virtual DataPort Administration tool** in the menu **"Tools" > "Web service container"** and also by executing the following VQL command: ***webcontainer status***. **I see that error page when the web container is still starting**.
Hope this helps!