Why is the TCP Congestion Window (cwnd) not growing?

Solution Verified - Updated -

Issue

  • Why is the TCP Congestion Window (cwnd) not growing?
  • The TCP congestion window was observed to be 68 for nearly an hour on a healthy network.
  • Slow throughput performance of TCP session

Environment

  • Red Hat Enterprise Linux
  • Network connection using TCP stream
  • tcp_cubic Congestion Control Algorithm

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