Openfire cluster Stress Test Error

root@openfire-v43:/etc/openfire# java -classpath xpp.jar:. OpenfireClusterStressTest
java.net.SocketException: Broken pipe (Write failed)
at java.net.SocketOutputStream.socketWrite0(Native Method)
at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:115)
at java.net.SocketOutputStream.write(SocketOutputStream.java:149)
at OpenfireClusterStressTest.send(OpenfireClusterStressTest.java:401)
at OpenfireClusterStressTest.testMultipleLogin(OpenfireClusterStressTest.java:133)
at OpenfireClusterStressTest.main(OpenfireClusterStressTest.java:46)
root@openfire-v43:/etc/openfire#