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RST, ACK Server to Host

Hello, I am new to these forums.

I have the following situation, a communication is being generated between a server with IP 172.16.10.12 (port 50500) and a host 172.30.2.11, the communication in some moments is interrupted and the application stops working, it has been detected in the capture that the server sends the RST and ACK flag, from one moment to another the application starts working, it is important to mention that the traffic passes through a fortinet UTM.

I attach the screenshot, could you please give me some clue of what may be happening.

https://drive.google.com/file/d/1_Ar0BTCxq2ApvyFfYmnC7Q_SVqYV-7OQ/view?usp=sharing

Thank you very much.

Ricardo