IBM Connections is not sending notifications

Today a customer ask why his IBM Connections is not sending notifications and recent upddates is not working anymore.

I got the SystemOut.log and see the following:

[10/1/15 11:20:15:201 BRT] 000001e2 JMSPublisher E com.ibm.lconn.events.internal.publish.impl.JMSPublisher publishEvent CLFWY0148E: Could not obtain an event connection
[10/1/15 11:20:15:201 BRT] 000001e2 LocalExceptio E CNTR0020E: EJB threw an unexpected (non-declared) exception during invocation of method "publishEvent" on bean "BeanId(Communities#lc.events.publish.jar#EventPublisher, null)". Exception data: com.ibm.lconn.events.internal.invoke.async.AsyncEventInvokerException: CLFWY0148E: Could not obtain an event connection
at com.ibm.lconn.events.internal.publish.impl.JMSPublisher.publishEvent(JMSPublisher.java:200)
at com.ibm.lconn.events.internal.publish.impl.JMSPublisher.publishEvent(JMSPublisher.java:164)


The problem: The message engine was not working (started).

To solve the problem:

1 - Shutdown the Connections nodes
2- Clear some files on the disk

/data/shared/messageStores//log/Log
/data/shared/messageStores//store/PermanentStore
/data/shared/messageStores//store/TemporaryStore

(Delete only the files but not the directories)

Restart the servers