title: No keepalive sent from client for 1171 seconds (>=180)
body: <p>I have a setup of sensu core(single server with muliple clients).
  I am facing the issue like - <code>'No keepalive sent from client for 7807 seconds (&gt;=180)'</code> from multiple clients though they instances are alive.</p>
  
  <p>I've checked the time in both client and server instances. It does not have much variations(only in secs). I tried to install ntpdate on both instances.</p>
  
  <pre><code>[root@client-machine user]# ntpdate pool.ntp.org
  31 Aug 14:07:50 ntpdate[14158]: the NTP socket is in use, exiting
  
  [root@server-machine:/home/user]# ntpdate pool.ntp.org
  31 Aug 14:08:04 ntpdate[29031]: the NTP socket is in use, exiting
  </code></pre>
  
  <p>At intermittently, status in uchiwa shows green for this client-machine and it automatically goes to RED for further checks</p>
  
  <p>Kindly advise to get rid of this problem!</p>