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How to check whether FTP port 21 is blocked?

The standard port used for FTP connections is 21. One of the most common reasons for not being able to send messages is that your Internet service provider blocks this port.

Here's how to, depending on your OS, check whether your ISP blocks port 21:

A. Check port 21 in Windows:

1. Click Start > Run
2. In the Open field, type cmd and click on OK button (or press Enter key)
3. MS-DOS Prompt Window opens
4. Type the following command in the command prompt window and press "Enter":
telnet <Your-domain-name>.com 21
where <Your-domain-name> should be replaced by the domain name that you have registered.

B. Check port 21 in Mac OS:

Each Mac OS is delivered with a preinstalled terminal emulator. The terminal is a tool which allows you to execute commands from the command line.

1. Open the Terminal Emulator.
Typically, the terminal is located under your Mac HD -> "Applications" directory -> Utilities sub-directory.
2. When the Terminal Emulator opens, you will see a command line with a flashing cursor.
3. Just type the following command and press "Enter":

telnet <Your-domain-name>.com 21
where <Your-domain-name> should be replaced by the domain name that you have registered.

C. Check port 21 in Linux:

Open your favorite terminal emulator and execute the following command in order to check the connection on port 21 to your website:

telnet <Your-domain-name>.com 21
where <Your-domain-name> should be replaced by the domain name that you have registered.

Results from the 21 port check:

If the test is successful, you should receive a message similar to this one:

220---------- Welcome to FTP ----------
220-Local time is now 03:35. Server port: 21.
220 You will be disconnected after 5 minutes of inactivity.



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