Is SSH over TCP or UDP?
So, SSH needs port 22/tcp. You're asking if opening 22/tcp and 22/udp presents a security vulnerability. The answer is "no" if nothing is listening to 22/udp.
- Secure Shell
- SSH, or Secure Shell, is a protocol used to securely log onto remote systems. It is the most common way to access remote Linux and Unix-like servers. In this guide, we will discuss how to use SSH to connect to a remote system.
- Port forwarding via SSH (SSH tunneling) creates a secure connection between a local computer and a remote machine through which services can be relayed. Because the connection is encrypted, SSH tunneling is useful for transmitting information that uses an unencrypted protocol, such as IMAP, VNC, or IRC.
Updated: 26th November 2019