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NTOP is a network monitor.
It has a web interface for viewing statistics.

I installed it via sudo apt-get install ntop on Ubuntu 2012.04, the daemon got started at the end of the install, without me doing anything special.

QUESTION: How to access the web interface?

http://localhost:4242 says Unable to connect.

I tried stopping the daemon and launching it in various ways:

sudo ntop -P /etc/ntop -W4242 -d
sudo ntop -P /var/lib/ntop/ -W4242 -d

But still Unable to connect.

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It should be http://hostname:3000/ or – atenz Jul 19 '12 at 10:35
That's it! I had read 4242 on some web page so I wasn't looking further... Could you please post this as an answer so that I can accept it? – Nicolas Raoul Jul 19 '12 at 10:56
Also allow port 3001 for password authentication. – jm_____ Jul 10 '14 at 13:42
up vote 6 down vote accepted

You can view and configure it through http://hostname:3000/ or

ntop focuses on :

  • Traffic measurement
  • Traffic monitoring
  • Network optimization and planning
  • Detection of network security violations

You can also go through the documentation and Man Pages for optimum usage.

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There are two ways to access the web-gui for NTOP.

-w --> This uses an unencrypted connection (the default). Port 3000 unless overridden.
-W --> Uses SSL encryption.


  1. Default Setup

    sudo ntop -d

    This would default to an unencrypted ntop service running on port 3000. To connect you would type http://[IP_ADDRESS_OF_SYSTEM]:3000 into the address bar of a web browser.

  2. Encrypted Setup

    sudo ntop -W 8080 -d

This results in an encrypted ntop service running on port 8080. To connect you would need to type https://[IP_ADDRESS_OF_SYSTEM]:8080 into the address bar of a web browser.

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