Iperf connection refused using mininet

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I have created a topology using below command and using POX as a remote controller.

sudo mn --switch=ovs --link tc,bw=10 --topo=tree,depth=2,fanout=2

This creates a topology with 1 controller, 3 Ovs switches and 4 hosts. When I use iperf h1 h2, the bandwidth testing works using TCP and results are shown in Mbits/sec.

But when I try to run the command iperf -c 10.0.0.3 or iperf -c 10.0.0.2 inside xterm h1, I get an error "connect Failed: Connection refused". In the same host ping works to the target host.

Please can someone help me here to solve the issue.