title: Putty error : Unable to open connection to hostname : Host does not exist
body: <p>I am using Putty to ssh into some of the servers that I work on. I am able to connect all others except the one. Although I was able to connect to it before. Whenever I try connecting to it, it always give me error:</p>
  <blockquote>
  <p>Unable to open connection on myhost: Host does not exist</p>
  </blockquote>
  <p>My firewall is off and I have even re-installed putty but that did not fix it. When I tried connecting to the same server using putty on some other windows system, I was able to do so.  I searched regarding this on Internet but did not find much relevant.</p>
  <p>I am running putty on Windows 7.</p>
  <p>What can be the possible issue?</p>