Properties weren't being read correctly from the server.json file. If you have been using server.json, please double check the format of the file here in our docs:
http://commandbox.ortusbooks.com/content/embedded_server/serverjson.html
This fix will make this functionality work as expected:
server set web.http.port=8000
server start
If you already have 3.0.0 then this fix only affects the CFML bits and is very easy for you to install. Simply run this command:
upgrade
If you're still on CommandBox 2.x, check out our 3.0.0 release announcement to see the cool new stuff.