I tried to reproduced but i got the following stacktrace (Connect step)
ERROR c.b.j.x.JMeterXMPPSampler: Error in XMPP Sampler:
org.jivesoftware.smack.SmackException$NoResponseException: null
at org.jivesoftware.smack.SynchronizationPoint.checkForResponse(SynchronizationPoint.java:176) ~[smack-core-4.1.0-alpha3.jar:4.1.0-alpha3]
at org.jivesoftware.smack.SynchronizationPoint.checkIfSuccessOrWait(SynchronizationPoint.java:110) ~[smack-core-4.1.0-alpha3.jar:4.1.0-alpha3]
at org.jivesoftware.smack.SynchronizationPoint.checkIfSuccessOrWaitOrThrow(SynchronizationPoint.java:93) ~[smack-core-4.1.0-alpha3.jar:4.1.0-alpha3]
at org.jivesoftware.smack.tcp.XMPPTCPConnection.connectInternal(XMPPTCPConnection.java:855) ~[smack-tcp-4.1.0-alpha3.jar:4.1.0-alpha3]
at org.jivesoftware.smack.AbstractXMPPConnection.connect(AbstractXMPPConnection.java:313) ~[smack-core-4.1.0-alpha3.jar:4.1.0-alpha3]
at com.blazemeter.jmeter.xmpp.actions.Connect.perform(Connect.java:21) ~[jmeter-plugins-xmpp-1.5.1.jar:?]
at com.blazemeter.jmeter.xmpp.JMeterXMPPSampler.sample(JMeterXMPPSampler.java:57) [jmeter-plugins-xmpp-1.5.1.jar:?]
at org.apache.jmeter.threads.JMeterThread.executeSamplePackage(JMeterThread.java:498) [ApacheJMeter_core.jar:3.3 r1808647]
at org.apache.jmeter.threads.JMeterThread.processSampler(JMeterThread.java:424) [ApacheJMeter_core.jar:3.3 r1808647]
at org.apache.jmeter.threads.JMeterThread.run(JMeterThread.java:255) [ApacheJMeter_core.jar:3.3 r1808647]