title: Bot Framework returning --There was an error sending this message to your bot: HTTP status code 401: Unauthorized
body: <p>I have deployed Chat Bot into window server but from few days I am getting following error in Bot “There was an error sending this message to your bot: HTTP status code InternalServerError” and application insight shows following message "Operation returned an invalid status code 'Unauthorized" and it has happened 8 times in last 4 days.</p>
  
  <p>What does it mean:</p>
  
  <p>1) Messages are not able to reach to the window server.</p>
  
  <p>2) Messages are reaching to the server and Chat bot is having some issue.</p>
  
  <p>3) It’s an issue at the Microsoft end</p>
  
  <p>I am using 3.15.3 version (Bot.builder).</p>
  
  <p>Has anyone run into the same problem?</p>