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SSH (Secure shell) is a protocol for secure communication between computers to execute remote commands, transfer data and tunnel TCP connections.

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Using non-standard ports for highly vulnerable applications is VERY GOOD practice. SSH has a lot of vulnerabilities and 22 is a common default port to brute force. That being said, it probably … depends. It's very common, especially in an enterprise environment, to see brute force attacks on DMZ servers against port 22. Many companies, in finance for instance, use a different default port for SSH
answered Jul 17 '18 by Justin