Should I block port 3389?
Having port 3389 open in your firewall can expose you to various security threats, such as man-in-the-middle attacks. Port 3389 is the default RDP port, making it an attractive target for hackers who know about its vulnerabilities. Never leave port 3389 exposed to the public Internet unless you cannot avoid it.These are the ports most targeted by attackers:

  • Ports 137 and 139 (NetBIOS over TCP) and 445 (SMB)
  • Port 22 (SSH)
  • Port 53 (DNS)
  • Port 25 (SMTP)
  • Port 3389 (remote desktop)
  • Ports 80, 443, 8080 and 8443 (HTTP and HTTPS)
  • Ports 20 and 21 (FTP)
  • Port 23 (Telnet)

Remote Desktop Protocol (RDP)

Overview. Remote Desktop Protocol (RDP) is a Microsoft proprietary protocol that enables remote connections to other computers, typically over TCP port 3389. It provides network access for a remote user over an encrypted channel.

Is it safe to block port 80 : Many administrators who manage web servers on their network tend to block traffic for port 80 (HTTP) and only allow 443 (HTTPS) with the hope that it will secure their network. This is a myth, and this article demonstrates why port 80 is no different than port 443 if your goal is to make your network secure.

How do I know if port 3389 is blocked

Open a command prompt Type in "telnet " and press enter. For example, we would type “telnet 192.168. 8.1 3389” If a blank screen appears then the port is open, and the test is successful. If you receive a connecting… message or an error message then something is blocking that port.

Is it safe to open RDP port : Exposing an adequately-secured RDP port on the open internet isn't a guaranteed entry point for attackers into your network, but it is a high and unnecessary risk that.

Yes you should. Block all ports except 80 & 443. Allow only SSH but make sure to change the default port to something else. If you are using a proxy server like HaProxy or Nginx in order to balance the requests then allow only the ip of the proxy server.

A port or berth will be unsafe if the ship is unable to reach the port safely. For example a port may be considered unsafe even if the ship suffers damage during its passage on a river or channel when approaching a port.

Is RDP safe without VPN

VPN offers an additional layer of encryption and IP address hiding but isn't always necessary for secure RDP. By employing tactics like changing your RDP port number and enabling firewall configuration analysis and cleanup, you can achieve secure RDP over the Internet without using VPN.Basic Security Tips for Remote Desktop

  1. Use strong passwords.
  2. Use Two-factor authentication.
  3. Update your software.
  4. Restrict access using firewalls.
  5. Enable Network Level Authentication.
  6. Limit users who can log in using Remote Desktop.
  7. Set an account lockout policy.

If these ports are blocked, then these applications can't run correctly, thereby reducing productivity and efficiency within your network. Lastly, if an attacker knows which ports are open or closed on a router, they may target specifically those port services for exploitation and gain access into your system.

Resolution

  1. Click Add Blank Rule.
  2. Double click Name field and set a proper name.
  3. Double click Action field and set to Block.
  4. Double click Service field. This will open the Service list.
  5. Click Add button. This will open the Protocol window.
  6. Set Protocol to TCP.
  7. Select Remote/Local.
  8. Set Local Port field to 3389.

How do I allow port 3389 in my firewall : Enabling Port 3389 in Windows Firewall

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.

How do I block port 3389 : Resolution

  1. Click Add Blank Rule.
  2. Double click Name field and set a proper name.
  3. Double click Action field and set to Block.
  4. Double click Service field. This will open the Service list.
  5. Click Add button. This will open the Protocol window.
  6. Set Protocol to TCP.
  7. Select Remote/Local.
  8. Set Local Port field to 3389.

Should I disable RDP

That utility is a standard part of all Windows installations, it is best not to remove it, but you can if you wish uninstall it. Select the Remove Tab and on there, ensure the option to allow Remote Connections is disabled. That will ensure no-one can connect remotely to your PC.

Port blocking can complicate application design and development and create uncertainty about whether applications will function properly when they are deployed. Port blocking can also cause applications to not function properly or “break” by preventing applications from using the ports they were designed to use.Here are some common vulnerable ports you need to know.

  • FTP (20, 21) FTP stands for File Transfer Protocol.
  • SSH (22) SSH stands for Secure Shell.
  • SMB (139, 137, 445) SMB stands for Server Message Block.
  • DNS (53) DNS stands for Domain Name System.
  • HTTP / HTTPS (443, 80, 8080, 8443)
  • Telnet (23)
  • SMTP (25)
  • TFTP (69)

Are open ports a risk : Open ports can be dangerous when the service listening on the port is misconfigured, unpatched, vulnerable to exploits, or has poor network security rules.