Why Does My Server Show 'Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host'?

Server read client connection error troubleshooting: "Unable to read data from the transport connection: The remote host forcibly closed the existing connection"

Server applications often encounter errors such as "Unable to read data from the transport connection: The remote host forcibly closed the existing connection", especially when the error occurs intermittently, the problem becomes more difficult. This error occurs when a client attempts to establish a connection with the server, but the connection is abruptly closed.

Problem root cause analysis

To find out the root cause of this error, let’s examine the provided code:

<code>// line 96:                 
a = sr.ReadLine();</code>

The

code uses StreamReader (sr) on line 96 to read a line from the client stream. However, if the connection is closed prematurely, the read operation will fail and an exception will be thrown.

Possible reasons

This error may be attributed to several factors:

• Transport Layer Security (TLS) Configuration: Insecure connections or mismatched TLS versions between client and server can cause connection issues.
• Network Outage: Temporary network outage or connection interruption can cause the connection to be suddenly closed.
• Client failure: Client software errors or unexpected events may cause the connection to be forcibly closed.

Solution

• Verify TLS configuration: Ensure that both client and server are using compatible and secure TLS versions. This can be achieved by adjusting the ServicePointManager attribute of SecurityProtocol .

  <code>  System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls12;</code>

• Monitor your network connection: Check the stability of your network connection to rule out temporary outages or unstable connections.

• Check client behavior: Investigate any issues or unusual behavior on the client that may cause the connection to terminate abnormally.

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