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copied!<p>To make my answer clearer I see three (3) systems here.</p> <ol> <li>The webserver running the PHP script; later refered as the WebServer</li> <li>The Unix server running on your client site; later refered to as the UnixServer</li> <li>The Exchange server running on your client site; later refered to as the ExchangeServer</li> </ol> <p>What you could do is use <a href="http://www.harding.motd.ca/autossh/" rel="nofollow noreferrer">autossh</a> to tunnel a connection from the WebServer through the UnixServer server with an endpoint at ExchangeServer. It is no end-to-end encrypton since you would not have an encrypted link from the UnixServer to the ExchangeServer it gets you closer to your goal.</p> <p>Full documentation on autossh can be found <a href="http://www.harding.motd.ca/autossh/README" rel="nofollow noreferrer">here</a></p> <p>The basic steps for the setup would be this:</p> <p>A. <a href="http://www.freebsdwiki.net/index.php/SSH:_Passwordless_authentication" rel="nofollow noreferrer">Setup passwordless authentication</a> from the WebServer to the UnixServer. You'll have to be carefull to protect the RSA key generated otherwise you've just opened a gaping hole on their system. Ideally run autossh under an unprivilege user and have the account used on the UnixServer to be unprivileged as well. <strong>Make sure you test the connection before you start using autossh</strong></p> <p>B. Setup your ssh options for keepalive (autossh is a fallback option). Make sure that the <code>~/.ssh/config</code> file for the user launching autossh has these option setup:</p> <pre><code>TCPKeepAlive yes ClientAliveInterval 60 ServerAliveInterval 15 ServerAliveCountMax 3 </code></pre> <p>C. Setup autossh. Linux.com as an articile about it <a href="http://www.linux.com/feature/134133" rel="nofollow noreferrer">here</a> and debianadmin.com as one <a href="http://www.debianadmin.com/autossh-automatically-restart-ssh-sessions-and-tunnels.html" rel="nofollow noreferrer">here</a>.</p>

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