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Troubleshooting steps when the server not responding to some SYNs

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What are the troubleshooting steps that I can take if I see that my Linux server does not respond to some of the SYNs that are being sent to it? (I know this from PCAPs that I recorded on my server) I see 2 possible solution here: Why would a server not send a SYN/ACK packet in response to a SYN packet

  1. Disabling TCP timestamps
  2. Disable recycling of TIME_WAIT

Does anyone have any additional checks / solutions?

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