EJB remote invocations are affected sometimes for a short period of time after an Exception is logged

Issue

• Sporadical a couple of EJBCLIENT000025 errors within the logfile, after enable DEBUG we saw the following DEBUG message

DEBUG [thread-3] org.jboss.ejb.client: Retrying invocation org.jboss.ejb.client.EJBClientInvocationContext@4b66500b which failed on node: Node1 due to:
org.jboss.ejb.client.RequestSendFailedException
    at org.jboss.ejb.client.remoting.RemotingConnectionEJBReceiver.processInvocationInternal(RemotingConnectionEJBReceiver.java:257)
    at org.jboss.ejb.client.remoting.RemotingConnectionEJBReceiver.processInvocation(RemotingConnectionEJBReceiver.java:215)
    at org.jboss.ejb.client.EJBClientInvocationContext.sendRequest(EJBClientInvocationContext.java:184)
    at org.jboss.ejb.client.EJBObjectInterceptor.handleInvocation(EJBObjectInterceptor.java:58)
    at org.jboss.ejb.client.EJBClientInvocationContext.sendRequest(EJBClientInvocationContext.java:186)
    at org.jboss.ejb.client.EJBHomeInterceptor.handleInvocation(EJBHomeInterceptor.java:83)
    at org.jboss.ejb.client.EJBClientInvocationContext.sendRequest(EJBClientInvocationContext.java:186)
    at org.jboss.ejb.client.TransactionInterceptor.handleInvocation(TransactionInterceptor.java:42)
    at org.jboss.ejb.client.EJBClientInvocationContext.sendRequest(EJBClientInvocationContext.java:186)
    at org.jboss.ejb.client.ReceiverInterceptor.handleInvocation(ReceiverInterceptor.java:125)
    at org.jboss.ejb.client.EJBClientInvocationContext.sendRequest(EJBClientInvocationContext.java:186)
    at org.jboss.ejb.client.EJBInvocationHandler.sendRequestWithPossibleRetries(EJBInvocationHandler.java:255)
    at org.jboss.ejb.client.EJBInvocationHandler.doInvoke(EJBInvocationHandler.java:200)
    at org.jboss.ejb.client.EJBInvocationHandler.doInvoke(EJBInvocationHandler.java:183)
    at org.jboss.ejb.client.EJBInvocationHandler.invoke(EJBInvocationHandler.java:146)
    at com.sun.proxy.$Proxy0.hasConnection(Unknown Source)
    ...
Caused by: java.lang.InterruptedException
    at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1301)
    at java.util.concurrent.Semaphore.acquire(Semaphore.java:317)
    at org.jboss.ejb.client.remoting.ChannelAssociation.acquireChannelMessageOutputStream(ChannelAssociation.java:261)
    at org.jboss.ejb.client.remoting.RemotingConnectionEJBReceiver.processInvocationInternal(RemotingConnectionEJBReceiver.java:239)
    ... 29 more

• logfile shows messages that a server is excluded from selection for the application

DEBUG [thread-3] org.jboss.ejb.client.EJBClientContext: Node1 is excluded from handling appname=MyApp,modulename=ejb,distinctname= in invocation context org.jboss.ejb.client.EJBClientInvocationContext@2a55600b