The logs for this are located in the sis-server.0.log or the sis-console.0.log, you may need to increase the log level in the sis-server.properties file in the Tomcat/Conf folder.
I have had problems with adding an AD server for authenticating users into the DCS console. Did you try using a Domain name instead of a specific AD server hostname?
One thing to try is run "echo %logonserver%" to see what machine the DCS manager is currently using for authentication, that may help.