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What is TCP SYN-ACK?
Attack description Client requests connection by sending SYN (synchronize) message to the server. Server acknowledges by sending SYN-ACK (synchronize-acknowledge) message back to the client. Client responds with an ACK (acknowledge) message, and the connection is established.
What is the default TCP connection timeout?
The Idle Timeout setting in the TCP profile specifies the length of time that a connection is idle before the connection is eligible for deletion. If no traffic flow is detected within the idle session timeout, the BIG-IP system can delete the session. The default is 300 seconds.
How often does TCP reset after SYN ACK?
In tcpdump I see, that the client’s device sends a SYN packet to which our server correctly replies with a SYN ACK. Immediately after that, our server receives a RST packet. After a few seconds the procedure repeats. Strangely enough, the connection is correctly established from time to time (about every 2 days around 8:30 am).
Why do I get RST packets after SYN ACK?
Immediately after that, our server receives a RST packet. After a few seconds the procedure repeats. Strangely enough, the connection is correctly established from time to time (about every 2 days around 8:30 am). I have tried redirecting the packets to another server but get the same problem with that server.
How does host _ a respond to a [ SYN, ACK ]?
The logs show that Host_A sends a [SYN] flag to Host_B in order to establish connection. But instead of [SYN, ACK] Host_B responds with an [RST, ACK] which resets/closes the connection. This behavior is observed always. I am wondering under what circumstance does a TCP listener sends [RST,ACK] in response to a [SYN]?
What does RST, ACK mean in Linux TCP?
But instead of [SYN, ACK] Host_B responds with an [RST, ACK] which resets/closes the connection. This behavior is observed always. I am wondering under what circumstance does a TCP listener sends [RST,ACK] in response to a [SYN]? RST, ACK means the port is closed. You sure Host_B is listening on the right IP/interface?