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Transport Layer Security (TLS), formerly known as Secure Sockets Layer (SSL), is a protocol used by applications to communicate securely across a network. All modern browsers support the TLS protocol, requiring the server to provide a valid digital certificate confirming its identity in order to establish a secure connection. It is possible for both the client and server to mutually authenticate each other, if both parties provide their own digital certificates. From version 74 onwards, Firefox will return a Secure Connection Failed error when connecting to servers using the older.
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