How to Locate Open Ports in Linux

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openports

What is a Port? 

First, let’s define what a port is. According to the IEFT, a port is: 

A logical entity for Internet communication. Ports serve two main purposes:
1. They provide a demultiplexing identifier to separate transport sessions between the same pair of endpoints
2. They may also identify the application protocol and associated service to which processes connect.

Wikipedia.com

In plain English, this simply means that a port is an endpoint through which data flows back and forth between two computers over a network. A computer has 65535 ports available to share information. These port numbers are based on a 16-bit number, which is where we derive the total number of available ports (0 to 65535).

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Ubuntu Bind Error: 98 SOLVED

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  • These instructions are intended specifically for solving the error: (98)Address already in use: make_sock: could not bind to address 0.0.0.0:80
  • I’ll be working from both Liquid Web Core Managed Ubuntu 12.04 LTS and 14.04 LTS servers, and I’ll be logged in as root.
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