If you happen to have an FTP connection issue, it’s essential to verify whether or not there’s a blockage in port 21. Unfortunately, some routers and firewalls block this port because hackers often target FTP servers via port 21. An FTP client cannot perform the protocol if it fails to connect to the FTP ports. In order to work correctly, FTP must use two ports - port 21 for command and control, and port 20 for data transport. In the new dialog box, check the Telnet Client box and click OK.įTP is an internet protocol that allows computers within the network to exchange files in bulk.On the left panel, select Turn Windows features on or off. Navigate to Programs -> Programs and Features.Press the Window+R keys together, then enter control to open up your Control Panel.In this example, we’ll be showing how to enable Telnet Client on Windows: In this case, it will help us test the connectivity to FTP port 21. Telnet is a client-server protocol that enables remote control over computers. Since we’re be using a Telnet command to check the connection, you need to ensure that your operating system has Telnet Client enabled. If that’s the case, we recommend you to contact your ISP to open the port. If the 220 response doesn’t appear, that means the FTP port 21 is blocked.If the FTP port 21 is not blocked, the 220 response will appear.This same command applies to all operating systems. Make sure to change the domain name accordingly. Open the system console, then enter the following line.Here’s how to check whether or not there’s a blockage in FTP port 21: You can find more information on how to access the system console on Windows, Linux, and macOS in this article. How to Check If Port 21 Is Open?īefore we begin, this tutorial will require access to your system console. In this guide, we’ll show you how to check if your FTP port 21 is open. 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.
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