Add these 2 lines just before the service is called. (.NET 4.8)
<pre><code class="lang-csharp">// using System.Net;
ServicePointManager.Expect100Continue = false;
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls12;
</code></pre>
For more information :
<a target="_blank" href="https://stackoverflow.com/questions/5420656/unable-to-read-data-from-the-transport-connection-an-existing-connection-was-f">https://stackoverflow.com/questions/5420656/unable-to-read-data-from-the-transport-connection-an-existing-connection-was-f</a>

Add these 2 lines just before the service is called. (.NET 4.8)

```csharp
// using System.Net;
ServicePointManager.Expect100Continue = false;
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls12;
```

For more information :

[https://stackoverflow.com/questions/5420656/unable-to-read-data-from-the-transport-connection-an-existing-connection-was-f](https://stackoverflow.com/questions/5420656/unable-to-read-data-from-the-transport-connection-an-existing-connection-was-f)

A developer's diary

A developer's diary

System.IO.IOException: Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host