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glossary:s:sni [2018/06/11 18:54] (current)
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 +# Server Name Indication
 +
 +Server Name Indication - SNI - is an extension of the [TLS](/​glossary/​t/​tls) TLS protocol. It allows clients to state which hostname they are trying to connect to.
 +
 +The server can then serve multiple server certificates on the same IP address and TCP port.
 +
 +This lets multiple TLS services to be served off the same IP address without requiring all those sites to use the same certificate.
 +
 +The conceptual HTTP equivalent is name-based virtual hosting.
 +