title: How to select a static port number for a custom app?
body: <p>We've got a custom application that needs to serve requests on it's own port number. We really don't care what the number is, although we'll stick to that port after we decide. How do I select a number which is least likely to conflict with other applications or services that are running on the user's system? </p>
  
  <p>Are there any rules or standards we should follow?</p>
  
  <p><strong>A clarification</strong>: once we pick a port, we need to stick with it. Can't use a dynamic one. We're building a custom SFTP server and we'll have to tell our customers what port it's running on.</p>