title: intermittent net::ERR_CONNECTION_RESET error
body: <p>I have a webpage that makes a POST request to a URL on a Tomcat web server. 99% of the time this all works fine however every month or 2 we get a few <em>external</em> users for whom the request does not get sent.  In Chrome the error is net::ERR_CONNECTION_RESET.  This means that our web server does not even receive the request or log anything.</p>
  
  <p>The interesting thing is that this error is not only intermittent but it seems to re-occur for only a handful of users. There are also people in the same network as the users experiencing the problem that are <em>not</em> experiencing the problem. I have never been able to reproduce this on any browser or machine. After a while (a few days maybe) the problem will go away and everything will be fine for a month or two.</p>
  
  <p>Can anyone provide some more information about what might be causing this error?  Everything I find online indicates that it's most likely a network problem on the client side but I don't know how to confirm this so that I can guide their IT in making the appropriate change to prevent this in the future. Could this ultimately be caused on the server side?  If this is a server side issue even better because then I could fix it on my end and prevent for other users.</p>