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Empezado por msdn2.microsoft.com

If You Use the TCP Channel with .NET Remoting, Consider System.Net.Security.NegotiateStream

In .NET Framework 1.1, remoting applications that use the TCP channel do not by default perform authentication or encryption. In .NET Framework 2.0, the remoting framework uses the new System.Net.Security.NegotiateStream class to encrypt and sign the data transported over the channel and to authenticate callers. To use this feature, you can configure the <channel> element in the Machine.config file, the Web.config file, or the App.config file, depending on whether you want to apply the setting across all applications on your computer or to a specific application.
The following example shows how a server specifies that authentication is required and that the channel should be protected with encryption.
<channel ref="tcp" port="1234"
authenticationMode="IdentifyCallers" secure="true" />

La nota completa aquí la puedes ver.

Salud OS.