Please enable make sure that the ntop html/ directory is properly installed

NTOP設置時出現「Please enable make sure that the ntop html/ directory is properly installed」

Error 400
The specified request is invalid.
Received request:

「GET / HTTP/1.1″

提示錯誤，多半是權限問題，可採用如下方法解決：
＃sudo chown -R ntop:ntop  /var/lib/ntop/           \\**改變owner**\
＃sudo chown -R ntop:ntop  /usr/share/ntop/
＃sudo ln -s /usr/share/ntop/html  /var/lib/ntop/     \\*創建一個符號連接*\\
＃sudo  /etc/init.d/ntop restart                                  重啓服務以便設置生效