title: Kohana PHP sessions problem under a local network
body: <p>I have a kohana (php) web site and we have a problem with the sessions when used by computers on a local network under a proxy.</p>
  
  <p>The problem:
  PC 1 and PC 2 are in the same local network. They use a proxy server to access the external web site.
  PC 1 access the site with "USER A", he is in the main page now and the site says "Connected with USER A".
  PC 2 enters the site and access with "USER B", he is in the main page now and the site says "Connected with USER B".
  PC 1 press F5 to reload the site main page, and the site now says that is logged with "USER B".</p>
  
  <p>The system is installed externally and we have this problem only in this under-proxy network. Access from other PCs also under local networks (but no proxy) don have this problem.</p>
  
  <p>We enabled the "user_token" part in the auth module (it uses a new table named "user_tokens" that uses the browser user agent), but the problem persists.</p>
  
  <p>-- edit --
  We are using Kohana 3.0, PHP 5.2.9 and postgres 8.4</p>