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

Add these 2 lines just before the service is called. (.NET 4.8) // using System.Net; ServicePointManager.Expect100Continue = false; ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls | SecurityProtocolType.Tls11 | SecurityProtocolType.Tl...