Why Am I Getting the 'Unable to read data from the transport connection' Error?

Troubleshooting "Unable to read data from the transport connection" Errors

The error message "Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host" indicates a problem establishing or maintaining a secure connection between a client and server. This often arises from mismatched Transport Layer Security (TLS) settings.

Root Causes and Solutions

Here's a breakdown of potential causes and how to resolve them:

• TLS Protocol Compatibility: Verify both server and client use compatible, up-to-date TLS protocols. In .NET, adjust the System.Net.ServicePointManager.SecurityProtocol property to include supported versions like Tls11 and Tls12.

• TLS Handshake Issues: Examine the TLS handshake process. The SecurityProtocol property is key; ensure server and client agree on a common protocol version during the ClientHello/ServerHello exchange.

• Client-Side Certificate Validation: Check the client's TLS settings to ensure acceptance of the server's certificates. Self-signed certificates or untrusted Certificate Authorities (CAs) can cause this error.

• Firewall/Security Software Interference: Confirm that firewalls or security software aren't blocking communication. Ports 443 (HTTPS) and 80 (HTTP) should be accessible.

• Network Connectivity Problems: Investigate unstable internet connections or network outages that might disrupt the connection.

Further Points to Consider:

• The error might be temporary and resolve itself.
• Restarting the server and/or client can sometimes fix the connection.
• Detailed logging and monitoring can pinpoint the error's source and assist in troubleshooting.

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