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HomeBackend DevelopmentC++Why Does My TCP Server Show 'Unable to Read Data from Transport Connection,' and How Can I Fix It?

Why Does My TCP Server Show

Troubleshooting "Unable to Read Data from Transport Connection" in TCP Servers

TCP servers sometimes encounter the error "Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host" when clients attempt to connect. This article explores common causes and provides a solution.

The error, often appearing around line 96 (in the provided server code example) during sr.ReadLine(), frequently stems from transport-level security misconfigurations.

TLS Handshake and Security Protocol Compatibility

A mismatch in TLS protocol versions between the client and server during the SSL/TLS handshake is a primary cause of this error. The System.Net.ServicePointManager.SecurityProtocol property is key to resolving this.

While .NET typically auto-negotiates TLS versions, inconsistencies between client and server capabilities can lead to handshake failure and the error message.

Solution: Explicitly Setting Security Protocols

To ensure compatibility, explicitly define the supported TLS versions using the SecurityProtocol property. Add this line before establishing the connection:

System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls12;

This code snippet enables support for TLS 1.0, 1.1, and 1.2. Matching TLS versions on both client and server guarantees a successful handshake, allowing the server to read data from the client without interruption.

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