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Also known as: 563, nntps port
The registered TCP port for NNTP over TLS, assigned under the name nntps. A client opening a connection here negotiates encryption before sending any command, so credentials never cross the network in the clear. It is the default in most newsreaders and download clients, and the setting providers publish first. Its plaintext counterpart is port 119.
Browse all terms in Protocol & Server Infrastructure, or see the full Usenet glossary.