JBoss Node throws lots of exceptions when using JBossWS with EJB Endpoints.

Issue

• A web service application is configured to be used in clustering exposed as an EJB Endpoint.
• We encounter the exceptions as the below in server.log files:

javax.ejb.EJBException: JBAS014516: Failed to acquire a permit within 5 MINUTES
        at org.jboss.as.ejb3.pool.strictmax.StrictMaxPool.get(StrictMaxPool.java:109)
        at ponent.pool.PooledInstanceInterceptor.processInvocation(PooledInstanceInterceptor.java:47)
        at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
        at org.jboss.as.ejb3.tx.CMTTxInterceptor.invokeInOurTx(CMTTxInterceptor.java:226)
        at org.jboss.as.ejb3.tx.CMTTxInterceptor.required(CMTTxInterceptor.java:302)
        at org.jboss.as.ejb3.tx.CMTTxInterceptor.processInvocation(CMTTxInterceptor.java:188)
        at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
        at ponent.interceptors.CurrentInvocationContextInterceptor.processInvocation(CurrentInvocationContextInterceptor.java:41)
        at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
        at ponent.interceptors.ShutDownInterceptorFactory$1.processInvocation(ShutDownInterceptorFactory.java:42)
        at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
        at ponent.interceptors.LoggingInterceptor.processInvocation(LoggingInterceptor.java:59)
        at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
        at ponent.NamespaceContextInterceptor.processInvocation(NamespaceContextInterceptor.java:50)
        at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
        at ponent.interceptors.AdditionalSetupInterceptor.processInvocation(AdditionalSetupInterceptor.java:32)
        at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
        at ponent.TCCLInterceptor.processInvocation(TCCLInterceptor.java:45)
        at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
        at org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:61)
        at ponent.ViewService$View.invoke(ViewService.java:165)
        at org.jboss.as.webservices.invocation.AbstractInvocationHandlerEJB.invoke(AbstractInvocationHandlerEJB.java:112)
        at org.jboss.wsf.stack.cxf.JBossWSInvoker._invokeInternal(JBossWSInvoke

• This happens every few hours and occures in logs very often. After a jboss restart everything is working again. The problem occures always on the same node.