TCP port number reused

[DCtech]

I am using STM32 TCP Echo server client Cube IDE example. I have server and client device. I can connect first time successfully but when I reset the client, I get after 70 line in wireshark screenshot. How Can I solve this problem ? What is the reason for this ?

https://i.stack.imgur.com/h8UTf.png

[DCtech]

Is there any answer for this ? I couldnt solve this problem. How can I communicate successfully under TCP ?