RHEL system behind a load balancer intermittently ignores new connection requests

Solution Verified - Updated -

Issue

  • RHEL system behind a load balancer intermittently ignores new connection requests
  • A RHEL server with a LB doing SNAT (source NAT) does not reuse connections in TIME_WAIT state
  • Unexpected Challenge ACK to new SYN on TCP tuple reuse
  • Windows clients sometimes cannot connect to Linux server behind F5

Environment

  • Red Hat Enterprise Linux (any version)
  • Load balancer or other network router/device performing Source NAT (SNAT) on client IP address
  • TCP (Transmission Control Protocol) with session reuse

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