How to close a tcp connection initiated by a client

Hi everyone,
I am utilizing a tcp in node with the type set to "Listen on". I am able to receive messages from connected clients, generate a reply to these messages with a complex data flow and finally send the reply to these clients with the tcp out node with the type set to "Reply to TCP". However, these clients are expecting the tcp server (my node red flow) to close the tcp connection. I was not able to figure out how to do that. Am I missing something?

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