Linux – iperf connect failed: Connection refused

failediperflinux

iperf -c 192.168.3.2 -i 2
connect failed: Connection refused

3.2 is another machine. I think the port might be blocked.

How can I make this work?

Best Answer

You also get a "connection refused" error when you use an iperf v3 client to send to an iperf v2 server.

The message is slightly different though:

iperf3: error - unable to connect to server: Connection refused

As the iperf3 doc states, they are not compatible (at least up to version 3.1.2). You can check the version on both server and client with

iperf -v
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