if you have errors launching a server, for example the VDP Server, you can try launching it from command Prompt (<DENODO_HOME>/bin/vqlserver_startup.bat/.sh). If the server is not started, you will get an error executing the script, so you can check what was the problem in that case.
Scheduler web admin tool, Diagnostic monitor tool and information self service tool are web admin tools deployed in embedded internal Tomcat web container provided with the Denodo Platform. This web container is started when launching any of the web admin tools and also when the VDP Server is started. If your VDP Server is running, you can check the status of the webcontainer by running in VQL Shell (Adminitration > VQL Shell):
*webcontainer status; *
Hope this helps!