VIRNETX EXHIBIT 2012
`Apple v. VirnetX
`Trial IPR2015-00812
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`Page 1 of 2
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`Administrator’s Guide
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`during the connection request. Aventail Connect will forward the host~
`name to the extranet (SOCKS) server in step 2 and the SOCKS server
`performs the hostname resolution.
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`lfthe DNS proxy option is enabled and the domain cannot be looked up
`directly, Aventail Connect creates a fake DNS entry that it can recog-
`nize later, and returns this to the calling application. The false entry tells
`Aventail Connect that the DNS lookup must be proxied, and that it must
`send the fully qualified hostname to the SOCKS server with the SOCKS
`connection request.
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`2. The application requests a connection to the remote host. This causes the
`underlying stack to begin the TCP handshake. When the handshake is com-
`plete, the application is notified that the connection is established and that
`data may now be transmitted and received. Aventail Connect does the follow-
`ing:
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`2
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`a. Aventail Connect checks the connection request.
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`if the request contains a false DNS entry (from step 1),
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`proxied.
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`lfthe request contains a routable IP address, and the rules in the
`configuration file say it must be proxied, Aventail Connect will call
`WinSock to begin the TCP handshake with the server designated
`in the configuration file.
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`If the request contains a real IP address and the configuration file
`rule says that it does not need to be proxied, the request will be
`passed to WinSock and processing jumps to step 3 as if Aventail
`l._._...... Connect were not running.
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`b. When the connection is completed, Aventail Connect begins the
`SOCKS negotiation.
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`- Once the server selects an authentication method, Aventail Con-
`nect executes the specified authentication processing.
`it then sends the proxy request to the extranet (SOCKS) server.
`This includes either the IP address provided by the application or
`the DNS entry (hostname) provided in step 1.
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`-
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`c. When the SOCKS negotiation is completed, Aventail Connect notifies
`the application. From the application’s point of view, the entire SOCKS
`negotiation, including the authentication negotiation, is merely the TCP
`handshaking.
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`3 The application transmits and receives data.
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`3 -——
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`If an encryption module is enabled and selected by the SOCKS server, Aven-
`tail Connect encrypts the data on its way to the server on behalf of the appli-
`cation. If data is being returned, Aventail Connect decrypts it so that the
`application sees cleartext data.
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`Page 2 on T
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`Petitioner Apple Inc. — Ex. 1009, p. 12
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`Aventail Connect 3.01/2.51 Administrator’s Guide - 12
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`Page 2 of 2