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TCP Ports for FTP

[Summary]File Transfer Protocol The File Transfer Protocol (FTP) is a standard network protocol used for the transfer of computer files between a client and server on a computer network. FTP is built on a client-server model architecture and uses separate con

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File Transfer Protocol

The File Transfer Protocol (FTP) is a standard network protocol used for the transfer of computer files between a client and server on a computer network.

FTP is built on a client-server model architecture and uses separate control and data connections between the client and the server.[1] FTP users may authenticate themselves with a clear-text sign-in protocol, normally in the form of a username and password, but can connect anonymously if the server is configured to allow it. For secure transmission that protects the username and password, and encrypts the content, FTP is often secured with SSL/TLS (FTPS). SSH File Transfer Protocol (SFTP) is sometimes also used instead; it is technologically different.

List of TCP and UDP port numbers

/etc/services, a service name database file on Unix-like operating systems.[1][2][3][4]

This is a list of Internet socket port numbers used by protocols of the transport layer of the Internet Protocol Suite for the establishment of host-to-host connectivity.

Originally, port numbers were used by the Network Control Program (NCP) in the ARPANET for which two ports were required for half-duplex transmission. Later, the Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP) needed only one port for full-duplex, bidirectional traffic. The even-numbered ports were not used, and this resulted in some even numbers in the well-known port number range being unassigned. The Stream Control Transmission Protocol (SCTP) and the Datagram Congestion Control Protocol (DCCP) also use port numbers. They usually use port numbers that match the services of the corresponding TCP or UDP implementation, if they exist.

Active FTP vs. Passive FTP, a Definitive Explanation

Active FTP vs. Passive FTP, a Definitive Explanation

Introduction

Active FTP Example

Passive FTP

Passive FTP Example

Other Notes

Appendix 1: Configuration of Common FTP Servers

Appendix 2: Firewall Configuration Guide

Introduction

One of the most commonly seen questions when dealing with firewalls and other Internet connectivity issues is the difference between active and passive FTP and how best to support either or both of them. Hopefully the following text will help to clear up some of the confusion over how to support FTP in a firewalled environment.

TCP/IP Ports and Protocols | TCP/IP Ports and Protocols | Pearson IT Certification

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One of the many fundamental things to know as a network engineer is the function and port number used by a number of common services as well as many that are typically implemented during the course of a network engineer’s career. Below, we take a look at these protocols, provides a basic description of their function, and lists the port numbers that they are commonly associated with.

What is an FTP port connection?

What is an FTP Port?

Resolving problems with a blocked FTP port

Active and Passive mode FTP connections

What is an FTP port?

The FTP, or the File Transfer Protocol, makes it possible for users to exchange files between their personal computers and remote servers with the help of specialized software tools called FTP clients. Through FTP software tools users can establish connections with a remote machine of their choice and perform any necessary data transfers. The FTP connections are executed through certain ports, which are either the default TCP ports or custom ports set by an administrator.

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