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Questions tagged [tcp-rst]

RST is one of the eight flags in the TCP-header that identifies that the TCP connection should be reset; colloquially, it's a small TCP packet that resets the connection, sent when the connection gets terminated with the close(2) system call.

Other common TCP header flags include SYN, ACK and FIN. Flag validity depends on the state of the TCP connection.

References:

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Drop an open TCP connection without sending RST

Looking into nginx: ignore some requests without proper Host header got me thinking that it's not actually possible to close(2) a TCP connection without the OS properly terminating the underlying TCP connection by sending an RST (and/or FIN) to the…
cnst
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How can I prevent Windows10 from sending a TCP RST to a particular IP nad PORT?

I have been analyzing packets sent out from my IP to a game server. The connection to the server was getting reset for some reason and after packet capture, I could see that there are TCP RST packets sent at the time of the disconnection. I have…
Arjun Ajith
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Can't accept incoming connections on c socket on Mac OS (Mojave) due to tcp RST packet

I have a problem with a server on MacOS using POSIX socket functions. The problem is that when my client try con connect to the server with the connect() function the server (macOS) send a tcp RST packet and close connection. I tried to disable the…
user10458285
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Understanding TCP RST in Wireshark

I need help to understand the red and black errors in Wireshark (see the attached screenshot). Those errors are produced when I try to access a large PDF file hosted in a static folder on IIS. My knowledge of TCP protocols is very limit. Any help is…
G Chen
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IIS sending RST flag on "Idle Connection Timeout"

Troubleshooting a intermittent connection issue we noticed that IIS 8.5 on "Idle connection timeout"(default 120sec) is sending a RST flag to Loadbalancer instead of FIN flag. Is this is a standard behaviour of IIS to send RST flag on idle…
Raj K
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