Problem

When performing manual synchronization of a cluster, it fails, and there appear errors in the Server Log similar to these:

Message: Cannot perform synchronization.

Stack Trace:

com.tumbleweed.st.server.cluster.manualsync.ManualSyncException: Unable to send Sync Start Event
at com.tumbleweed.st.server.cluster.manualsync.ManualSyncExecutor.sendSyncStart(ManualSyncExecutor.java:254)
at com.tumbleweed.st.server.cluster.manualsync.ManualSyncExecutor.performSync(ManualSyncExecutor.java:137)
at com.tumbleweed.st.server.admin.configuration.ProcessClusterActionContext.synchronizeAll(ProcessClusterActionContext.java:112)
...
Caused by: com.tumbleweed.st.server.events.AgentEventException: Event Error 7: Failed to send event AgentEvent [mAgentType=24, mAgentTrigger=64, mTarget=null, mEventData=(Enable debug to see), mExpectStream=true] on CommandChannel=null at com.axway.st.server.streaming.provider.StreamingProvider.processEvent(StreamingProvider.java:217)
at com.tumbleweed.st.server.events.AbstractEvent.execute(AbstractEvent.java:319)
at com.tumbleweed.st.server.events.SyncStartEvent.invoke(SyncStartEvent.java:31)
at com.tumbleweed.st.server.events.SyncStartEvent.send(SyncStartEvent.java:27)
at com.tumbleweed.st.server.cluster.manualsync.ManualSyncExecutor.sendSyncStart(ManualSyncExecutor.java:250)
... 43 more
Caused by: com.tumbleweed.st.server.events.AgentEventException: Event Error 7: Unable to submit event AgentEvent [mAgentType=24, mAgentTrigger=64, mTarget=null, mEventData=(Enable debug to see), mExpectStream=true] on CommandChannel=null at com.axway.st.server.streaming.provider.StreamingProvider.sendEvent(StreamingProvider.java:241)
at com.axway.st.server.streaming.provider.StreamingProvider.processEvent(StreamingProvider.java:215)
... 47 more
Caused by: java.io.IOException: No connected clients at com.axway.st.server.streaming.client.StreamingClientImpl.connect(StreamingClientImpl.java:60)
at com.axway.st.server.streaming.provider.StreamingProvider.makeChannel(StreamingProvider.java:159)
at com.axway.st.server.streaming.provider.StreamingProvider.sendEvent(StreamingProvider.java:236)
... 48 more

Resolution

This occurs when the Administration streaming listener (by default, port 20444) is not up. Causes of this can include:

a misconfigured Private Network Zone. That Zone's address should be set to localhost on each box in the cluster. Also, in that Zone, Admin needs to be enabled.

something else listening on that port

firewall issues (e.g. iptables rules)