Wildfly13 to WildFly13 remote ejb call only works intermittently

[sergiu_pienar]

I have a class, deployed inside a jar, packed in an EAR, deployed to a WildFly 13 instance.

From this class, I'm remoting calling a secured bean on another WildFly 13 instance.

The client code:

// create your authentication configuration
AuthenticationConfiguration ejbConfig = AuthenticationConfiguration.empty()
.setSaslMechanismSelector(SaslMechanismSelector.NONE.addMechanism("PLAIN")).useRealm("myRealm").useName(username)
.usePassword(password);
// create your authentication context
AuthenticationContext context = AuthenticationContext.empty().with(MatchRule.ALL, ejbConfig);
AuthenticationContext.getContextManager().setThreadDefault(context);
// create an InitialContext
Properties properties = new Properties();
properties.put(Context.INITIAL_CONTEXT_FACTORY, "org.wildfly.naming.client.WildFlyInitialContextFactory");
properties.put(Context.PROVIDER_URL, "remote+http://" + host + ":" + port);
InitialContext ctx = new InitialContext(properties);
// look up an EJB and invoke one of its methods (same as before)
CustomCodeRemote remoteEjb = (CustomCodeRemote)ctx
.lookup("ejb:acme-all-5.4.1.4/acme-all-ejbs/CustomCodeBean!com.business.customcode.CustomCodeRemote");
List results = remoteEjb.queryByClientAndJarName(-1L, "acme-dhelpers.jar");
System.out.println(results);

The outbound socket:

<outbound-socket-binding name="ejb-outbound">

<remote-destination host="192.168.0.105" port="8080"/>

</outbound-socket-binding>

Remoting subsystem:

<subsystem xmlns="urn:jboss:domain:remoting:4.0">

<http-connector name="http-remoting-connector" connector-ref="default" security-realm="myRealm" sasl-authentication-factory="elytron-sasl-authentication">

<sasl/>

</http-connector>

<outbound-connections> 

<remote-outbound-connection name="ejb-outbound-connection" outbound-socket-binding-ref="ejb-outbound" authentication-context="ejb-outbound-context"/> 

</outbound-connections>

</subsystem>

Authentication client defined within the elytron subsystem:

<authentication-client> 

<authentication-configuration name="ejb-outbound-configuration" security-domain="myElytronDomain" sasl-mechanism-selector="PLAIN"/> 

<authentication-context name="ejb-outbound-context"> 

<match-rule authentication-configuration="ejb-outbound-configuration"/> 

</authentication-context> 

</authentication-client>

The Elytron domain is fine, I'm using it for securing the web-app deployed in the EAR, and also for calling the EJBs from a standalone client.

The problem is that the server to server call only works intermittently.

Any ideas ?