C# WinForms (TcpClient) - Unable to read/write data from/to the transport connection: An existing connection was forcibly closed by the remote host?

I suspect that it's because you forget to 'close' the 'NetworkStream' objects. If you don't do it, GC will. However, when GC collects the 'NetworkStream' objects is not deterministic, which is why you see this random behavior.

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