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A command that upgrades an already open plaintext NNTP connection to an encrypted one, without changing ports. The client connects on 119, issues STARTTLS, and the TLS handshake follows before any password is sent. It suits servers that cannot dedicate a second port, but implicit TLS on 563 is more common with commercial providers and avoids the risk of a downgrade.
Browse all terms in Protocol & Server Infrastructure, or see the full Usenet glossary.