November 15, 2019
November 15, 2019
Having issues connecting to your FTP account? It’s worth checking your port 21! Here, we’ll show you how to check if your FTP port 21 is open. By the end of this article, you’ll know whether or not the port is the culprit behind the connection issue.
FTP is an internet protocol that allows computers within the network to exchange files in bulk. To work properly, 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 one of the ports.
Unfortunately, some routers and firewalls block this port because hackers often target FTP servers via port 21.
So if you happen to have an FTP connection issue, it’s essential to verify whether or not there’s a blockage in port 21.
This tutorial requires access to your system console. This article provides the steps to access system console in Windows, Linux, and macOS.
As we will use the Telnet command to check the connection, you need to ensure that your operating system enables Telnet Client.
Telnet is a client-server protocol that enables remote control over computers. In this case, it will help us test the connectivity to port 21. If you’re using Windows, here’s how to enable Telnet Client:
Here’s how to check whether or not there’s a blockage in FTP port 21:
telnet yourdomain.com 21
As some routers and firewalls block FTP port 21 due to security reasons, it’s essential to check the port’s connection before performing the File Transfer Protocol. By following our tutorial, we hope you’re able to verify whether or not the port is open.
March 22 2018
ISP...is it "internet special person"?
Replied on March 23 2018
Hey Gogu, :) No, ISP = Internet Service Provider.