June 16, 2020
June 16, 2020
Having issues connecting to your FTP account? If that’s the case, it’s worth checking whether port 21 is the culprit behind the connection failure. In this guide, we’ll show you how to check if your FTP port 21 is open.
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Before we begin, this tutorial will require access to your system console. You can find more information on how to access the system console on Windows, Linux, and macOS in this article.
Here’s how to check whether or not there’s a blockage in FTP port 21:
telnet yourdomain.com 21
220 FTP Server ready.
Since we’re be using a Telnet command to check the connection, you need to ensure that your operating system has Telnet Client enabled.
Telnet is a client-server protocol that enables remote control over computers. In this case, it will help us test the connectivity to FTP port 21. In this example, we’ll be showing how to enable Telnet Client on Windows:
FTP is an internet protocol that allows computers within the network to exchange files in bulk. In order to work correctly, FTP must use two ports — port 21 for command and control, and port 20 for data transport. An FTP client cannot perform the protocol if it fails to connect to the FTP ports.
Unfortunately, some routers and firewalls block this port because hackers often target FTP servers via port 21.
If you happen to have an FTP connection issue, it’s essential to verify whether or not there’s a blockage in port 21.
Some routers and firewalls block FTP port 21 due to security reasons, so it’s essential to check the port’s connection before performing the File Transfer Protocol. You can find more information on FTP here.
We hope you found this tutorial helpful. If you have any more questions, don’t hesitate to leave a comment down below.
March 22 2018
ISP...is it "internet special person"?
Replied on March 23 2018
Hey Gogu, :) No, ISP = Internet Service Provider.