title: Twilio with c# asp.net webapi
body: <p>I am implementing simple Twilio service for sending sms using c#.</p>
  
  <p>I want to receive the status of the message sent to any number, so I created Asp.Net WebAPI HTTP post method (status call back) and exposed to Twilio like  below. But every time I send message, this http post method is not receiving any and my Twilio trial account logging the below message</p>
  
  <blockquote>
    <p>You are receiving this email because your Twilio account has
    encountered an error or warning and the On 1st error every day Alert
    Trigger has fired. The most recent alert was:</p>
    
    <p>"11200 - HTTP retrieval failure"</p>
  </blockquote>
  
  <p>The URL I used for the status call back is public domain and https.</p>
  
  <p>Am I doing something wrong here ? Please help me.</p>
  
  <p>Code </p>
  
  <pre><code>var message = twilio.SendMessage(
            "+14439173365", 
            "+1xxxxxxxx", 
            "Sample Twilio message",
            "https://www2.xxxx.com/webservices/Reminder/V1/WebAPI/Reminder/TwilioAPI/MessageStatusCallBack");
  </code></pre>