if you run http://<server>:<port>/ if that does not give a web page then thats a fair indication your system is either still starting or is in trouble. As NWDI takes a couple of minutesmax to start the applications (as opposed to a portal) then I would expect a return on this fairly soon after startup.
It may be that the URL/Port is wrong or there are connection issues.
You can use the stand alone log viewer or the log viewer in visual administrator to look at the dtr logs and the default.trc logs also for issues but a restart first is always good.
What dtr URL have you specified in NWDS and have you changed it since you last successfully logged on last. Any details like this will point to the likely suspect that we can help further with.
What setting to you have in the menu path Windows - Preferences - Java Development Infrastructure - Development configuration?... this should point to your SLD and the Ping Server button should work.
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