Listening TCP server ignores SYN or ACK for new connection handshake

Solution Verified - Updated -

Issue

  • Listening server ignores SYN for new TCP handshake
  • Listening TCP server ignores ACK for new connection
  • RHEL 5 and RHEL 6: The following stats are seen with the same value in netstat -s:
TcpExt:
    XXX times the listen queue of a socket overflowed
    XXX SYNs to LISTEN sockets ignored
  • RHEL 7: The value of times the listen queue of a socket overflowed may be larger than the value of SYNs to LISTEN sockets ignored

Environment

  • Red Hat Enterprise Linux
  • TCP listening process

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