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<seo title="How to check whether FTP port 21 is blocked" metakeywords="port block,telnet,command line" metadescription="How to check whether FTP port 21 is blocked" />
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<div align=justify>All FTP clients make connections via port 21. Sometimes Internet Service Providers (ISP) block this port, therefore causing FTP connection issues. 

Below you will find the steps for different operating systems to check possible port block:

* '''''Check port 21 with Windows'''''

Open the Start menu, then click on "Run" tab. The new window should open. In this window you need to type "cmd" and then press "Enter". Another window will open. It is the so called "MS-DOS prompt" or "command line". Just enter the following command in the command line window and press "Enter":

 ''telnet yourdomain.com 21''

* '''''Check port 21 with Apple/Mac'''''

Each Mac OS is equipped with a terminal utility. This tool allows you to run commands from the command line. Usually, the command line is located under your Mac HD -> Applications -> Utilities. When the window opens, type the following command and press "Enter":

 ''telnet yourdomain.com 21''

* '''''Check port 21 with Linux'''''

Open the terminal utility (Applications -> Utilities -> Terminal) and run the following command in order to telnet your website:

 ''telnet yourdomain.com 21''

If the test is successful, you should see the following message:

 220---------- Welcome to Pure-FTPd [privsep] [TLS] ----------
 220-You are user number 1 of 50 allowed.
 220-Local time is now 03:25. Server port: 21.
 220-IPv6 connections are also welcome on this server.
 220 You will be disconnected after 15 minutes of inactivity.

If there is no similar message, you should contact your ISP and ask them to remove the port block for you.</div>

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