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# Answer '''yes''' to add to the list of known hosts.
[[Image:spoof.png|thumb|right|485px|If you receive a message like the one displayed above, you should investigate why it is happening as it could indicate a '''serious security issue''', or it could just mean that something on '''the host has changed'''(i.e. the OS was <u>reinstalled</u>)]]
<ol><li value="65">Logout of your ssh connection by typing <b><code><span style="color:#3366CC;font-size:1.2em;">exit</span></code></b>.<li>Check Run the netstat command in another terminal and check the state of the connection after logging out. Wait a few minutes and then check again. Record your observations.</li>
<li>Make certain to exit all connections, and that your shell is located in your <u>centos3</u> server. You can verify this by entering the command: <b><code><span style="color:#3366CC;font-size:1.2em;">hostname</span></code></b>
<li>Use the Internet to search for "TCP 3 way handshake" to see how TCP connections are established and closed.<br><br></li>