I\'ve got a Solr instance running on my Ubuntu machine using the default Jetty server that the Solr download comes with. Whenever I start Solr using
This may not always be the case, but when I got a similar issue, it turned out that restarting the Solr server using restart command didn't suffice. Explicitly stopping the server with the stop command and then starting it using the start command actually did the trick. I did not require to edit any file.
P.S. My issue was with only /clustering not being accessible for my Solr core.