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Are some ports more secure than others?
All ports are potentially at risk of attack. No port is natively secure. “Each port and underlying service has its risks. There is a total of 65,535 TCP ports and another 65,535 UDP ports; we’ll look at some of the diciest ones.
What port numbers are safe to use?
2 Answers. Long story short anything above 1024 is “safe” if I am understanding your definition of safe. Although, I can certainly check all ports on your box. My impression (please correct if I am wrong) but most people scanning boxes usually do not go above 1024 on a broad range scan.
Do port numbers matter?
To be clear, there is no technical difference between ports. The ranges and assignments are all based on historical usage and convention. A game server could run on port 80, but that would be unconventional since port 80 is almost always associated with a web server.
What is the most secure port?
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.
What is the importance of well known port numbers?
Port numbers from 0 to 1023 are reserved for common TCP/IP applications and are called well-known ports. The use of well-known ports allows client applications to easily locate the corresponding server application processes on other hosts.
What is the range of port numbers?
0 – 65,535
The Internet Assigned Numbers Authority (IANA) administrates the port numbers in the range of 0 – 65,535.
What does obscuring ports on high numbers do?
Obscuring ports on high numbers like this only stops simple bots which will look for well known ports. Script kiddies and determined hackers can simply port scan the rest of the port range to find a service, so you are only stop some log noise. It doesn’t really matter about convention of not listening on the standard port for that service.
Which is a better way to obscure SSH?
A better way to obscure SSH which actually works is to do a port knock. This involves closing off the port at iptables until a sequence of ports have been “knocked” that then will open the desired port. EG you might send a packet to 8000 4545 28882 7878.
Why do some people use non-standard ports?
Why some people use non-standard ports Although each network service is assigned a standard port by IANA (Internet Assigned Numbers Authority) – e.g. FTP is normally configured to listen on port 21, HTTP on port 80, and SFTP on port 22 – there are really no hard and fast rules that prohibit the use of other (non-reserved) port numbers.
Is it safe to use a different port number?
As no genuine user would know about these port numbers then any connection attempt must be considered malicious and you can block/report the offending IP address automatically. There is a special case where using a different port number will definitely make your system more secure.