Hello Konstantinos
In Rene’s post, he says:
In the cloudshark capture that he shared, you can see in packet number 7 the Reset flag is set to 1. This is also indicated with the “RST” flag shown in the info column of the capture, as indicated below:
The RST or reset flag is set whenever a segment arrives that doesn’t meet the criteria of a currently active session or connection. In other words, it refuses the connection.
I hope this has been helpful!
Laz