Request.UserHostAddress return IP address of Load Balancer

Question

I have a critical line of code in my site that worked in our development environment but not on production. Well, I say it worked in development but the truth is it gave

Answer 1

In reference to @Damien_The_Unbeliever's answer, here's the complete solution:

public static string GetIpAddress()
{
  var request = HttpContext.Current.Request;
  // Look for a proxy address first
  var ip = request.ServerVariables["HTTP_X_FORWARDED_FOR"];

  // If there is no proxy, get the standard remote address
  if (string.IsNullOrWhiteSpace(ip)
      || string.Equals(ip, "unknown", StringComparison.OrdinalIgnoreCase))
    ip = request.ServerVariables["REMOTE_ADDR"];
  else
  {
    //extract first IP
    var index = ip.IndexOf(',');
    if (index > 0)
      ip = ip.Substring(0, index);

    //remove port
    index = ip.IndexOf(':');
    if (index > 0)
      ip = ip.Substring(0, index);
  }

  return ip;
}