RFC 3620:The TUNNEL Profile
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Proxies


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... attempting to establish the connection is named "initial", while the intermediate proxies are "proxy1" or "proxy2", and the machine with the service that "initial" wishes to access is called "final". The ...


... end-to-end manner after a TUNNEL has been established will prevent intermediate proxies from observing or modifying the cleartext information exchanged, but only if TLS ...



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