CyberGuard SG300 User Manual page 232

If the HTTP proxy is a buffering proxy, then enter the Proxy Buffer Size. Otherwise set
this field to 0. You may also specific the timeout before sending padding to fill up the
buffer size in Proxy Padding Timeout.
The following field is displayed for SSL Tunnel Server only:
You may specify the Protocol to use when negotiating the SSL connection. Leave this
set to Raw connecting to a tunnel server. Setting Protocol to another value allows the
tunnel client to connect directly to an SSL server other than a tunnel server, e.g. a mail
server configured to use POP3 over SSL.
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Virtual Private Networking