HTTPS/TLS/SSL application connection attempts fail going through a firewall

Solution Verified - Updated -

Issue

  • HTTPS/TLS/SSL application connection attempts fail going through a firewall
  • The client is responding with RST to a Challenge ACK but the server is failing to close the existing socket.
  • New connections to the server is failing intermittently during peak hours.
  • RHEL replies with an ACK to SYN instead of SYN-ACK.

Environment

  • Red Hat Enterprise Linux 9
  • Red Hat Enterprise Linux 8
  • External connection-tracking firewall (eg: Palo Alto, Fortinet FortiGate)

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