UDP traffic is replied to with ICMP Destination Unreachable / Port Unreachable

Solution Verified - Updated -

Issue

  • UDP traffic is replied to with ICMP Port Unreachable
  • Server sending ICMP Type 3 Code 3 Destination Unreachable / Port Unreachable
  • Load balancer does a UDP port check every second

Environment

  • Red Hat Enterprise Linux 8
  • UDP

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