{"id":83,"date":"2023-10-06T08:39:39","date_gmt":"2023-10-06T08:39:39","guid":{"rendered":"https:\/\/new.hostitsmart.com\/manage\/knowledgebase\/?p=83"},"modified":"2025-04-04T11:57:41","modified_gmt":"2025-04-04T11:57:41","slug":"how-to-check-if-ftp-port-21-is-blocked","status":"publish","type":"post","link":"https:\/\/www.hostitsmart.com\/manage\/knowledgebase\/83\/how-to-check-if-ftp-port-21-is-blocked.html","title":{"rendered":"Guide to Check If FTP Port 21 Is Available or Blocked"},"content":{"rendered":"\n

Introduction<\/strong><\/h2>\n\n\n\n

As an administrator, have you ever faced challenges while transferring files using FTP? If your answer is ‘Yes,’ then one simple issue that causes this problem is whether port 21 is available or blocked. <\/p>\n\n\n\n

Port 21 is a standard FTP port that is responsible for smooth communication between your client and the server. If this port is blocked, your request won’t go through, making it impossible to connect, log in, or transfer files effectively. <\/p>\n\n\n\n

In this guide, we will discuss simple steps to check if FTP port 21 is open or blocked on your network. Let’s dive in and get your FTP connections up and running.<\/p>\n\n\n\n

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Also Read: <\/strong>How to Create an FTP Account in WordPress?<\/strong><\/a><\/p>\n

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What is FTP Port 21?<\/strong><\/h2>\n\n\n\n

FTP (File Transfer Protocol) is a simple yet highly versatile network protocol. This protocol helps to seamlessly transfer computer files between a client and a server over a computer network. This protocol is also important because it allows data to be exchanged for large file transfers and bulk data movement.<\/p>\n\n\n\n

Port 21 is the usual port used for FTP connections. When a client starts an FTP session, it connects to the server through port 21. This connection manages commands and controls for transferring files, including logging in, browsing folders, and asking to transfer files.<\/p>\n\n\n\n

Network admins and system engineers must understand Port 21. FTP file transfers use Port 21 as the primary point of contact for FTP control connections. You can use Port 21 to troubleshoot network issues, configure firewalls, and check the functioning of FTP services.<\/p>\n\n\n\n

What makes port 21 so important?<\/strong><\/h2>\n\n\n\n

The availability of port 21 can influence your firewall settings, network configurations, and the FTP server you’re trying to connect to. Suppose you face issues with the availability of port 21. <\/p>\n\n\n\n

In that case, you must consult your network administrator or ISP or check the FTP server documentation for further troubleshooting.<\/p>\n\n\n\n

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Also Read: <\/strong>How To Get FTP Password From FileZilla<\/strong><\/a><\/p>\n

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How to Check If FTP Port 21 Is Not Blocked?<\/strong><\/h2>\n\n\n\n

\u27a2 On Windows<\/h3>\n\n\n\n

To confirm if FTP port 21 is available or blocked on your Windows system, you must follow these steps:<\/p>\n\n\n\n

\u2794 Open Command Prompt:<\/strong> Press \u2018Windows + R\u2019<\/strong> to open the \u2018Run\u2019<\/strong> dialog. <\/p>\n\n\n

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\"Open<\/figure>\n<\/div>\n\n\n

\u2794 Type \u2018cmd\u2019<\/strong> and press \u2018Enter.\u2019<\/strong><\/p>\n\n\n

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\"Type<\/figure>\n<\/div>\n\n\n

Use Telnet:<\/strong> Enter the following command. Please replace \u2018mycompany.com\u2019<\/strong> with the actual domain name or IP address of the FTP server to which you wish to connect.<\/p>\n\n\n\n

telnet mycompany.com 21<\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Let’s understand the results:<\/strong><\/p>\n\n\n\n

If you receive a message stating the below message, this means the port is open and available.<\/p>\n\n\n\n

220 FTP server ready<\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

If you receive an error message stating the below message, This means the port is blocked or there is an issue with establishing the connection.<\/p>\n\n\n\n

Could not open a connection to the host, on port 21: connect failed<\/strong><\/p>\n\n\n\n

Note:<\/strong> Telnet is a legacy protocol and may not be enabled by default on newer Windows versions. You might need to enable it in the Windows Features settings.<\/p>\n\n\n\n

To do this, follow the following steps:<\/strong><\/p>\n\n\n\n

\u2794 Press \u2018Windows + R\u2019<\/strong>, type \u2018control panel\u2019<\/strong>, and press \u2018Enter\u2019<\/strong><\/p>\n\n\n

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\"type<\/figure>\n<\/div>\n\n\n

\u2794 Click on \u2018Programs\u2019<\/strong><\/p>\n\n\n

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\"Click<\/figure>\n<\/div>\n\n\n

\u2794 In that \u2018Turn Windows features on or off\u2019<\/strong> under \u2018Programs and Features.\u2019<\/strong><\/p>\n\n\n

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\"Click<\/figure>\n<\/div>\n\n\n

\u2794 In the Windows Features window, scroll down and check the box next to \u2018Telnet Client.\u2019<\/strong><\/p>\n\n\n

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\"check<\/figure>\n<\/div>\n\n\n

\u2794 Click \u2018OK\u2019<\/strong> to install Telnet.<\/p>\n\n\n

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\"Cllick<\/figure>\n<\/div>\n\n\n

After these steps, Telnet should be available for remote network management or troubleshooting purposes.<\/p>\n\n\n\n

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Also Read: <\/strong>How to Connect to FTP Using FileZilla on Windows?<\/strong><\/a><\/p>\n

<\/p>\n\n\n\n

\u27a2 On Linux<\/h3>\n\n\n\n

To check if FTP port 21 is available or blocked on your Linux system, follow these steps:<\/p>\n\n\n\n

\u2794 Open Terminal:<\/strong> Use the terminal emulator (e.g., xterm, gnome-terminal) to access the command line.<\/p>\n\n\n\n

\u2794 Use Telnet:<\/strong> Enter the following command. Please replace \u2018mycompany.com\u2019<\/strong> with the actual domain name or IP address of the FTP server to which you wish to connect.<\/p>\n\n\n\n

telnet mycompany.com 21<\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Let’s understand the results:<\/strong><\/p>\n\n\n\n

\u2794 If you receive a message stating the below message, this means the port is open and available.<\/p>\n\n\n\n

220 FTP server ready<\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\u2794 If you receive an error message stating the below message, This means the port is blocked or there is an issue with establishing the connection.<\/p>\n\n\n\n

Could not open a connection to the host, on port 21: connect failed<\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Note:<\/strong> Telnet is a legacy protocol and may not be installed by default on some Linux distributions. You might need to install it using your package manager (e.g., apt, yum, dnf). <\/p>\n\n\n\n

For example, on Ubuntu<\/strong>, you can install telnet using:<\/p>\n\n\n\n

Sudo apt install telnet<\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

If you encounter issues with telnet, you can also use tools like nc (netcat) or nmap to check port availability:<\/p>\n\n\n\n

Using nc:<\/strong><\/p>\n\n\n\n

nc mycompany.com 21<\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Using nmap:<\/strong><\/p>\n\n\n\n

nmap -p 21 mycompany.com<\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

These tools will provide information about the port’s status without requiring a full FTP connection.<\/p>\n\n\n\n

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Also Read: <\/strong>How to Fix Can\u2019t Connect to Filezilla Server Error<\/strong><\/a><\/p>\n

<\/p>\n\n\n\n

\u27a2 On Apple Mac<\/h3>\n\n\n\n

To check if the FTP port 21 is available or blocked on your macOS system, you must use the built-in Terminal application:<\/p>\n\n\n\n

1. Open Terminal:<\/strong> Go to \u2018Applications<\/strong> > Utilities\u2019<\/strong> and launch \u2018Terminal.\u2019<\/strong><\/p>\n\n\n\n

2. Use Telnet:<\/strong> Enter the following command. Please replace \u2018mycompany.com\u2019<\/strong> with the actual domain name or IP address of the FTP server to which you wish to connect.<\/p>\n\n\n\n