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I have a Windows 2008 server and an application that connects over Internet to it. From time to time I see that I receive a TCP [RST, ACK] that is ignored by my application. Using TCPViewer I still can see that connection still up. I did different Wireshark captures and I can see that in case of the RST ignore, another packet is send back, and the connection is never dropped.

269037 72.5.42.235  172.16.1.138 TCP 60 9003→54020 [RST, ACK]
    Seq=2655287284 Ack=371936778 Win=0 Len=0
269038 172.16.1.138 72.5.42.235  TCP 66 [TCP Dup ACK 268965#33] 54020→9003 [ACK]
    Seq=371936778 Ack=2655238984 Win=2097120 Len=0 SLE=2655243124 SRE=2655287284

This usually happens when the connection is bad and I get a lot of latency, delayed packets and retransmission. Can somebody explain the situation when RST may be ignored by an application or operating system?

  • "I have a Windows 2008 server and an application that connects over Internet to it." Oh here we go... What is your problem? What leads you to believe that a sysadmin can fix it? – BlueCompute Oct 1 '14 at 15:32
  • I'm sorry, but I did not know that this is a sysadmin group. I just wanted to know the situations when a [RST, ACK] packet may be ignored, and it does not result in closing a TCP connection. – Adrian R Oct 1 '14 at 15:51
  • That's because you didn't read the Help tour or FAQ. You might want to try your question at networkengineering.stackexchange.com – BlueCompute Oct 2 '14 at 12:46

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