Which Ports Are Secure?

Port 22 is SSH (Secure Shell), port 80 is the standard port for HTTP (Hypertext Transfer Protocol) web traffic, and port 443 is HTTPS (Hypertext Transfer Protocol Secure)—the more secure web traffic protocol.

Which ports are safe to open?

Which of these ports are safe to leave open, which are not?

• PORT STATE SERVICE.
• 21/tcp open ftp.
• 22/tcp open ssh.
• 23/tcp open telnet.
• 80/tcp open http.
• 443/tcp open https.
• 3389/tcp open ms-term-serv.

What are security ports?

Ports are another essential asset through which security can be breached. In computer science, ports are of two types – physical ports (which is a physical docking point where other devices connect) and logical ports (which is a well-programmed docking point through which data flows over the internet).

What ports are commonly hacked?

Commonly Hacked Ports

• TCP port 21 — FTP (File Transfer Protocol)
• TCP port 22 — SSH (Secure Shell)
• TCP port 23 — Telnet.
• TCP port 25 — SMTP (Simple Mail Transfer Protocol)
• TCP and UDP port 53 — DNS (Domain Name System)
• TCP port 443 — HTTP (Hypertext Transport Protocol) and HTTPS (HTTP over SSL)

What ports should be closed?

For example, the SANS Institute recommends blocking outbound traffic that uses the following ports:

• MS RPC – TCP & UDP port 135.
• NetBIOS/IP – TCP & UDP ports 137-139.
• SMB/IP – TCP port 445.
• Trivial File Transfer Protocol (TFTP) – UDP port 69.
• Syslog – UDP port 514.

Is port 23 secure?

Commonly Abused Ports
Typically, it is used for remote management. While it is generally considered secure, it requires proper key management. Port 23 – Telnet. A predecessor to SSH, is no longer considered secure and is frequently abused by malware.

Are TCP ports secure?

All ports are potentially at risk of attack. No port is natively secure.There is a total of 65,535 TCP ports and another 65,535 UDP ports; we’ll look at some of the diciest ones. TCP port 21 connects FTP servers to the internet.

Is port 22 secure?

Avoid Port 22
Port 22 is the standard port for SSH connections. If you use a different port, it adds a little bit of security through obscurity to your system. Security through obscurity is never considered a true security measure, and I have railed against it in other articles.

Is port 80 safe to open?

Forwarding port 80 is no more insecure than any other port. In fact, port forwarding itself is not inherently insecure. The security concern is that it allows services that are normally protected behind some kind of firewall to be accessible publicly.

Is port 9000 Secure?

By connecting to the 9000 port on the vulnerable device, a remote attacker could exploit this vulnerability to view, modify, delete and upload new files to the USB storage device. Observa Telecom VH4032N could allow a remote attacker to gain unauthorized access to the system.

What is port 135 commonly used for?

Port 135 is used for RPC client-server communication; ports 139 and 445 are used for authentication and file sharing. UDP ports 137 and 138 are used for local NetBIOS browser, naming, and lookup functions.

Which ports are blocked by firewall?

Ports restricted even from UI networks

• Port 123: NTP UDP. Blocked: In to unapproved servers. This port is associated with NTP, the network time protocol.
• Ports 161 UDP-162 TCP/UDP: SNMP. Blocked: Inbound.
• Ports 1434 UDP and 41170 UDP: Denial of service file sharing. Blocked: Both in and out.

What ports should I close on my router?

If your router has built-in firewall software, you can use it to close port 21; instructions for doing so will vary depending on your router. But you can also close ports using Windows’ built-in firewall, and the process is very similar no matter what firewall software you use.

Should I close all my ports?

You should always see all ports closed unless you have a server function running and you port forwarded the ports. Its not like you have a web server in your house so why would you expect the port to be open. It is likely some issue with the firewall on you PC especially if VPN works.

How can I make my port 80 secure?

Safe to Open Port 80 and 443?

1. Keep the server patched! Not patching leads to vulnerabilities!
2. Keep unnecessary roles and services off this server! Adding a file server to your web server just creates a bigger attack vector for hackers.
3. Proxy these requests.
4. Monitor these requests.
5. Keep AV up to date on this server.

What can hackers do with open ports?

Malicious (“black hat”) hackers (or crackers) commonly use port scanning software to find which ports are “open” (unfiltered) in a given computer, and whether or not an actual service is listening on that port. They can then attempt to exploit potential vulnerabilities in any services they find.

Is FTP port 21 secure?

Port 21 and File Transfer
Port 21 is commonly associated with FTP. FTP has been assigned to Port 21 by the Internet Assigned Numbers Authority (IANA). The IANA also oversees global IP address allocation. FTP is often thought of as a “not secure” file transfer protocol.

Why is port 443 secure?

Port 443 is a virtual port that computers use to divert network traffic.HTTPS is secure and is on port 443, while HTTP is unsecured and available on port 80. Information that travels on the port 443 is encrypted using Secure Sockets Layer (SSL) or its new version, Transport Layer Security (TLS) and hence safer.

Why is SSH bad?

The result? SSH keys left unaccounted for can provide attackers with long-term privileged access to corporate resources. If attackers gain access to a key that is never revoked or rotated, the attackers could have a permanent network entry point and impersonate the user that the SSH key originally belonged to.

Why is port 22 often blocked by the firewall?

Sometimes while connecting to SSH servers, users often encounter “Connection refused” error by port 22. It happens because of several reasons like SSH service is not running, the port is blocked by the firewall, or the server is using a different port. It can also occur because of the IP conflict issue.

How do I protect my port 22?

Top 10 Tips to Secure SSH Your Server

1. Use a different port than 22.
2. Use Protocol SSH 2 only.
3. Disable Direct root login.
4. Use public_keys instead of passwords.
5. Enable two-factor authentication.
6. Disable Empty Passwords.
7. Use strong passwords and passphrase for ssh users/keys.
8. Configure Idle Timeout Interval.