I too just installed Unlimited with WSC on a Mac with Webstar 4.0. It seems that Webstar doesn't recognize the WSC servlet or it's not available or something.
From checking the instructions, it's in the right folder-as per the instructions, I moved the "WebStar Java Servlet Runner" from the WebStar plug-ins folder and replaced it with "FMWSC". I have gone down the list to see if any files were not installed as the install seemed very quick and simple and everything seems to be correct.
Here's the message I get when I try and run the WSC Admin application in the Webstar root folder:
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ServletExec Failed to Create Thread
Error. Request failed because ServletExec failed to create a thread.
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Any help is appreciated, this is a new area for me.
I'll wait for Mikuta's answer (or anyone else's) before wasting my one precious call to Filemaker.
Thanks for any help. Rick