Why Am I Getting the 'Unable to Read Data from Transport Connection' Error in My C# Code?

Debugging the "Unable to Read Data from Transport Connection" Error

Client-server communication can sometimes be disrupted by the "Unable to read data from the transport connection" error. This error typically indicates a problem with the underlying transport connection.

A common cause is the remote host unexpectedly closing the connection. This can be due to network instability or other unforeseen circumstances.

In your situation, the error occurs on line 96 of your "sThread" method, specifically within the "sr.ReadLine()" call attempting to read client data. This strongly suggests the client terminated the connection prematurely, preventing successful communication.

To resolve this, consider improving connection reliability and error handling. One approach is to configure the SecurityProtocol property of System.Net.ServicePointManager to include appropriate TLS protocols. This ensures a compatible protocol version is used during the initial handshake.

Analyzing the TLS handshake's "ClientHello" and "ServerHello" messages can provide valuable diagnostic information. Ensuring the client specifies its highest supported TLS version in "ClientHello" and that the server responds with a compatible version in "ServerHello" helps eliminate protocol mismatch problems.

By implementing these strategies, you can significantly reduce the occurrence of the "Unable to read data from the transport connection" error and create more robust and reliable client-server communication.

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