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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:
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