title: Exchange 2019 EWS error: Microsoft.Exchange.WebServices.Data.ServiceRequestException: The request failed. The underlying connection was closed
body: <p>i am trying to connect to an Exchange 2019 using the EWS managed API. The connection already worked to Exchange 2010, 2013, 2016 and Office 365 (Exchange Online).</p>
  <p>I have no idea why it doesn't work with Exchange 2019. I was currently able to test with two servers. It didn't work with either.</p>
  <p>The error message is:</p>
  <pre><code>Microsoft.Exchange.WebServices.Data.ServiceRequestException: The request failed. The underlying connection was closed. An unexpected error occurred on a send
  </code></pre>
  <p>Maybe someone can help me</p>
  <p>Thank you</p>