iperf3 error exactly 7 seconds into running the test

Question

I am running an iperf test to measure bandwidth from a host iperf client to a container iperf server.Exactly 7 seconds into the test iperf gives an error & abruptly ends the test. The message says " iperf3: error - received an unknown control message" Please see the screenshot below https://i.sstatic.net/GzpYY.jpg Would you know why this is?

Answer 1

Your client is running iperf3 while your server is running iperf, or vice versa. Ensure both run iperf3.