AIX to Linux TCP session ends in TCP Reset after some time

Solution Unverified - Updated -

Issue

  • AIX to Linux TCP session ends in TCP Reset after some time
  • RHEL7 system talks out to AIX on a random port. Eventually, responses from AIX to RHEL7 stop working, and AIX sends a RESET packet. This problem disappears if I enable a full trust in RHEL7 firewalld to the AIX host.

Environment

  • Red Hat Enterprise Linux 7
  • TCP (Transmission Control Protocol)
  • AIX at other end of TCP stream
  • TCP Keepalives enabled on AIX
  • iptables firewall doing connection tracking (conntrack) on Linux

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