C# HttpClient An existing connection was forcibly closed by the remote host

I don’t see in your code sample where you are setting the value of _baseUrl, but I’m assuming that is being done somewhere. I’m also assuming that since this related to payments, the URL is HTTPS. If the remote host has disabled TLS 1.0 and your connection is coming in as TLS 1.0, it could cause that behavior. I know C# 4.6 has TLS 1.0/1.1/1.2 support enabled by default, but I think C# 4.6 still defaults to only SSL3/TLS 1.0 even though TLS 1.1 and 1.2 are supported. If this is the cause of the issue, you can manually add TLS 1.1 and 1.2 to the enabled values using the following code.

System.Net.ServicePointManager.SecurityProtocol |= SecurityProtocolType.Tls11 | Secur

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