SSH (Secure Shell) is a protocol designed for secure remote access and is always built on TCP, typically on port 22. UDP is not supported for SSH, as it is connectionless and doesn't provide the required reliability and order.
“SSH is a TCP-based protocol. It does not support UDP. TCP ensures session reliability and data integrity, which are critical for SSH.”
[Reference:, Huawei HCIE-Datacom Study Guide – Secure Management Protocols, Huawei USG Series Security Configuration Guide, ]
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