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    BlogPort 3389: Definitions, Solutions & Tips

    Port 3389: Definitions, Solutions & Tips

    Emily Stewart • Oct 9, 2023
    Emily StewartOct 9, 2023
    5min read

    When it comes to remote desktop connections, port 3389 stands out as a pivotal component. It's the default port used by the Remote Desktop Protocol (RDP), a proprietary protocol developed by Microsoft. This protocol allows users to connect remotely to a computer or server, granting them access to its desktop environment. Specifically, TCP port 3389 is utilized for RDP communication, making it an essential tool for remote administration and support. As we delve deeper into this topic, we'll uncover the intricacies of this port and offer solutions and tips for its optimal use.

    Part 1. What Is Port 3389 Used For?

    Understanding Port 3389

    Port 3389, commonly known as the RDP port 3389, is the default port used by the Remote Desktop Protocol (RDP). RDP is a proprietary protocol developed by Microsoft that facilitates users to connect remotely to another computer or server, thereby accessing its desktop environment. This port is essential for enabling Remote Desktop connections to other computers, allowing remote network access over an encrypted route.

    While port 3389 is instrumental in remote desktop connections, it's not without its vulnerabilities. The open nature of this port can sometimes serve as a gateway for hackers to compromise systems. There are several methods to address these vulnerabilities and ensure a secure computing environment:

    • Implementing secure tunneling to lock down port 3389.
    • Configuring firewalls to permit access to port 3389 only from a designated list of safe IP addresses. However, this defense can be bypassed by hackers if they manage to hijack a computer on the safe list.
    • Changing port 3389 to an alternative port number can slow down potential attacks and limit risks.

    Remote Desktop and Port 3389

    The remote desktop port 3389 is the default for using the Remote Desktop. To perform a remote session, this port needs to be open. There are two primary scenarios for this:

    • Allowing Remote Desktop on the Local Network: This involves opening the port through the Windows Firewall.
    • Allowing Remote Desktop over the Internet: In this case, the RDP port should be allowed through the Windows Firewall and forwarded through the main Internet router.

    While RDP is a powerful tool, there are other professional remote desktop software options available that offer more features and security measures.

    Part 2. How To Open Port 3389 On Remote Desktop?

    Enabling Port 3389 in Windows Firewall

    To ensure that the TCP port 3389 remote desktop connection works seamlessly, it's crucial to open port 3389 in the Windows Firewall. Here's a step-by-step guide:

    • Access Windows Settings: Press the Windows key + i simultaneously.
    • Navigate to Update & Security > Windows Security. Then, click on Firewall & Network Protection from the right-hand listing. This action will open a new window.


    • Click on the link titled Allow an app through the firewall.


    • Click on Change settings.


    • Search for Remote Desktop in the list. It should be present by default. If not, click on Allow another app button and navigate to C:\Windows\System32\mstsc.exe.


    • To allow Remote Desktop on the local network only, check the checkbox labeled Private. If you wish to make it publicly available, check the Public checkbox as well.
    • Click OK to save the changes.

    Configuring Port 3389 on Your Router

    If you're looking to use the TCP 3389 Remote Desktop over the Internet, you'll need to configure your router. Here's how:

    • First, ensure that you've allowed the RDP port through the public network from Windows Firewall as described above.
    • Access your router’s configuration page. Typically, this would be your default gateway, e.g.,
    • After logging in, navigate to the section where you can define traffic rules or port forwarding settings.
    • Create a new rule or port forwarding entry.
    • Specify the port as 3389.


    • Under NAT Translation or a similar setting, enable destination NAT, specify the IP address of your computer, and set the port translation to 3389.


    Changing the Default RDP Port

    For added security, especially if you're opening RDP over the Internet, it's recommended to change the default port from 3389 to a higher value, preferably above 10000.

    Verifying Port 3389 Status

    To check if port 3389 is open and listening:

    • Open PowerShell by pressing Run > type powershell.
    • Run the command: tnc -port 3389.


    This will help you verify if the port is accessible remotely.

    Part 3. TCP Port 3389 Security Risks And Vulnerabilities

    The Popularity and Utility of RDP

    Remote Desktop Protocol (RDP) over TCP port 3389 is a widely recognized and standard method to offer remote access capabilities to remote workers. It's a protocol that provides the ability to access a desktop computer remotely. Given that it's a Microsoft technology and many organizations heavily rely on Windows Server and Windows client technologies, RDP is the most prevalent remote desktop access protocol in use today. It's built into Windows Server and client operating systems, requiring no additional downloads to use.

    RDP Vulnerabilities

    Despite its utility, the Remote Desktop Protocol has historically been highly susceptible to various forms of attacks, allowing hackers to breach and compromise systems. Some of the vulnerabilities associated with RDP include:

    • Encryption Concerns: Unlike HTTP and FTP, which are unencrypted, RDP is transmitted over an encrypted channel. This encryption prevents attackers from "listening" to network traffic and compromising sensitive data. However, there have been issues with RDP encryption in the past.
    • Security Vulnerabilities: There have been known vulnerabilities associated with RDP that hackers have exploited.
    • Misconfiguration: Incorrectly configured RDP settings can expose systems to potential threats.
    • Brute Force Attacks: Attackers often use brute force methods to guess passwords and gain unauthorized access to systems via RDP.

    Securing RDP

    Given the vulnerabilities associated with RDP, it's crucial to implement measures to secure it. One such measure is to lock down port 3389. Secure tunneling software can help prevent attackers from sending requests that reach this port. With a secure tunnel in place, any requests that do not pass through the tunnel will be blocked.

    In conclusion, while RDP offers a convenient way for remote access, it's essential to be aware of its vulnerabilities and take necessary precautions to ensure secure connections.

    Part 4. How To Change The Default RDP Port 3389?

    Changing the default RDP port can enhance security by making it harder for attackers to identify and exploit the RDP service. Here's a step-by-step guide to change the default RDP port:

    • Access the Registry Editor: Press the Windows Key + R, type "regedit," and press Enter.
    • Navigate to the RDP Registry Key: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp.
    • Modify the Port Number: On the right-hand side, find the "PortNumber" registry entry. Double-click on it to modify its value.
    • Set the New Port: Choose the "Decimal" base and input the new port number you wish to use for RDP (e.g., 5000).
    • Save and Exit: Click OK to save the changes and then close the Registry Editor.
    • Restart Your Computer: To apply the new RDP port, restart your computer.

    After the restart, when connecting to the Remote Desktop, ensure to append the new port number to the IP address or hostname (e.g., or example.com:5000). Also, remember to adjust any firewall or router configurations to allow incoming connections on the new port.

    Tips: The Best and Free RDP Alternative - Avica

    While the RDP 3389 protocol is widely used for remote desktop connections, there are several alternatives available that offer unique features and enhanced security. One such alternative is Avica Remote Desktop.

    Avica stands out as a top alternative to traditional remote desktop solutions. It's renowned for its user-friendly design, making it easy for both tech-savvy individuals and beginners to navigate and use. With the end-to-end AES-256 encryption, unlike the traditional port 3389 used for RDP, Avica provides a seamless and secure connection experience.

    You can easily download Avica software by clicking the button provided below. For more detailed information regarding Avica App downloads, please visit the official Avica download page. It is important to note that Avica ensures the safety and virus-free nature of all products available on its official website or app store. Feel confident in downloading Avica from these trusted sources.

    Free Download

    How to Use Avica

    • Download and Install: Install and launch Avica on your local and remote devices.
    • Setup: Follow the on-screen instructions to set up your account and configure the software.


    • Connect: Once set up, you can easily connect to remote devices by entering the remote device's unique Avica ID and password.


    • Navigate: The intuitive interface allows you to access files, run applications, and perform other tasks on the remote device with ease.


    Avica's ease of use, combined with its robust security features, makes it a preferred choice for many looking for remote desktop solutions beyond the traditional RDP.

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    The world of remote desktop connections is vast and intricate, with port 3389 standing at its core. This protocol, while incredibly useful, comes with its own set of challenges and vulnerabilities. However, with the right knowledge and tools, users can navigate the complexities of 3389 RDP and ensure secure, efficient remote access. As technology continues to evolve, it's essential to stay updated and explore alternatives that offer enhanced features and security. Whether you're an IT professional or an everyday user, understanding the intricacies of 3389 RDP is crucial for a seamless and secure remote desktop experience.

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