title: Need to test remote mysql connection
body: <p>Last week I updated a clients website - then several days later they phoned up telling me that their admin system has a connection problem.
  ( Error : Unable to connect to any of the specified mysql hosts )</p>
  
  <p>Their admin system is a winform application which connects remotely to a mysql database - and they somehow think its my fault... they are not technical and their IT guy quit 2-3 days before they starting having any issues.
  The Website is working perfectly and i'm able to remote connect to the database and Admin program from my location - so everything is working perfectly for me.</p>
  
  <p>So:</p>
  
  <ul>
  <li>I've checked the mysql user and privileges settings (managed via
  phpmyadmin) - their username and the allowed host/IP are correct.</li>
  <li>Their IP was aready whitelisted on the server.</li>
  </ul>
  
  <p>I'm thinking that theres an internal firewall issue ( apparently they did have a firewall issue around the time this issue started ) but I need a way of testing/proving this. </p>
  
  <p>( I'm a web developer not an network IT admin )</p>