This issue appears in EAP 6.2.0 CR3. 
Failing tests: 
org.jboss.as.test.integration.naming.ExternalContextBindingTestCase.testWithActualLDAPContextWithCache
org.jboss.as.test.integration.naming.ExternalContextBindingTestCase.testWithActualLDAPContextWithoutCache

See e.g.:
https://jenkins.mw.lab.eng.bos.redhat.com/hudson/view/EAP6/view/EAP6-AS-Testsuite/job/eap-60-as-testsuite-Solaris-matrix-OracleJDK6/BITS=-d64,jdk=java16_default,label_exp=solaris10%26%26sparc/lastCompletedBuild/testReport/org.jboss.as.test.integration.naming/ExternalContextBindingTestCase/

https://jenkins.mw.lab.eng.bos.redhat.com/hudson/view/EAP6/view/EAP6-AS-Testsuite/job/eap-60-as-testsuite-Solaris-matrix-OracleJDK6/BITS=-d64,jdk=java16_default,label_exp=solaris10%26%26sparc/lastCompletedBuild/testReport/org.jboss.as.test.integration.naming/ExternalContextBindingTestCase/

HPUX server log (Solaris is equivalent):

09:54:19,278 INFO  [org.jboss.as.test.integration.naming.ExternalContextBindingTestCase] (pool-1-thread-4) looking up java:global/ldap ....
09:54:19,284 ERROR [org.jboss.arquillian.protocol.jmx.JMXTestRunner] (pool-1-thread-4) Failed: org.jboss.as.test.integration.naming.ExternalContextBindingTestCase.testWithActualLDAPContextWithoutCache: javax.naming.NamingException: java.lang.reflect.InvocationTargetException [Root exception is java.lang.RuntimeException: java.lang.reflect.InvocationTargetException]
	at org.jboss.as.naming.ServiceBasedNamingStore.lookup(ServiceBasedNamingStore.java:141)
	at org.jboss.as.naming.ServiceBasedNamingStore.lookup(ServiceBasedNamingStore.java:80)
	at org.jboss.as.naming.NamingContext.lookup(NamingContext.java:197)
	at org.jboss.as.naming.NamingContext.lookup(NamingContext.java:174)
	at org.jboss.as.naming.InitialContext.lookup(InitialContext.java:122)
	at org.jboss.as.naming.NamingContext.lookup(NamingContext.java:183)
	at org.jboss.as.naming.NamingContext.lookup(NamingContext.java:179)
	at javax.naming.InitialContext.lookup(InitialContext.java:411) [rt.jar:1.7.0.06]
	at org.jboss.as.test.integration.naming.ExternalContextBindingTestCase.testWithActualLDAPContextWithoutCache(ExternalContextBindingTestCase.java:333) [externalContextBindingTest.jar:]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [rt.jar:1.7.0.06]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) [rt.jar:1.7.0.06]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [rt.jar:1.7.0.06]
	at java.lang.reflect.Method.invoke(Method.java:601) [rt.jar:1.7.0.06]
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47) [arquillian-service:]
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) [arquillian-service:]
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44) [arquillian-service:]
	at org.jboss.arquillian.junit.Arquillian$6$1.invoke(Arquillian.java:270) [arquillian-service:]
	at org.jboss.arquillian.container.test.impl.execution.LocalTestExecuter.execute(LocalTestExecuter.java:60) [arquillian-service:]
	at sun.reflect.GeneratedMethodAccessor17.invoke(Unknown Source) [:1.7.0.06]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [rt.jar:1.7.0.06]
	at java.lang.reflect.Method.invoke(Method.java:601) [rt.jar:1.7.0.06]
	at org.jboss.arquillian.core.impl.ObserverImpl.invoke(ObserverImpl.java:90) [arquillian-service:]
	at org.jboss.arquillian.core.impl.EventContextImpl.invokeObservers(EventContextImpl.java:99) [arquillian-service:]
	at org.jboss.arquillian.core.impl.EventContextImpl.proceed(EventContextImpl.java:81) [arquillian-service:]
	at org.jboss.arquillian.core.impl.ManagerImpl.fire(ManagerImpl.java:135) [arquillian-service:]
	at org.jboss.arquillian.core.impl.ManagerImpl.fire(ManagerImpl.java:115) [arquillian-service:]
	at org.jboss.arquillian.core.impl.EventImpl.fire(EventImpl.java:67) [arquillian-service:]
	at org.jboss.arquillian.container.test.impl.execution.ContainerTestExecuter.execute(ContainerTestExecuter.java:38) [arquillian-service:]
	at sun.reflect.GeneratedMethodAccessor16.invoke(Unknown Source) [:1.7.0.06]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [rt.jar:1.7.0.06]
	at java.lang.reflect.Method.invoke(Method.java:601) [rt.jar:1.7.0.06]
	at org.jboss.arquillian.core.impl.ObserverImpl.invoke(ObserverImpl.java:90) [arquillian-service:]
	at org.jboss.arquillian.core.impl.EventContextImpl.invokeObservers(EventContextImpl.java:99) [arquillian-service:]
	at org.jboss.arquillian.core.impl.EventContextImpl.proceed(EventContextImpl.java:81) [arquillian-service:]
	at org.jboss.arquillian.test.impl.TestContextHandler.createTestContext(TestContextHandler.java:89) [arquillian-service:]
	at sun.reflect.GeneratedMethodAccessor6.invoke(Unknown Source) [:1.7.0.06]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [rt.jar:1.7.0.06]
	at java.lang.reflect.Method.invoke(Method.java:601) [rt.jar:1.7.0.06]
	at org.jboss.arquillian.core.impl.ObserverImpl.invoke(ObserverImpl.java:90) [arquillian-service:]
	at org.jboss.arquillian.core.impl.EventContextImpl.proceed(EventContextImpl.java:88) [arquillian-service:]
	at org.jboss.arquillian.test.impl.TestContextHandler.createClassContext(TestContextHandler.java:75) [arquillian-service:]
	at sun.reflect.GeneratedMethodAccessor5.invoke(Unknown Source) [:1.7.0.06]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [rt.jar:1.7.0.06]
	at java.lang.reflect.Method.invoke(Method.java:601) [rt.jar:1.7.0.06]
	at org.jboss.arquillian.core.impl.ObserverImpl.invoke(ObserverImpl.java:90) [arquillian-service:]
	at org.jboss.arquillian.core.impl.EventContextImpl.proceed(EventContextImpl.java:88) [arquillian-service:]
	at org.jboss.arquillian.test.impl.TestContextHandler.createSuiteContext(TestContextHandler.java:60) [arquillian-service:]
	at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source) [:1.7.0.06]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [rt.jar:1.7.0.06]
	at java.lang.reflect.Method.invoke(Method.java:601) [rt.jar:1.7.0.06]
	at org.jboss.arquillian.core.impl.ObserverImpl.invoke(ObserverImpl.java:90) [arquillian-service:]
	at org.jboss.arquillian.core.impl.EventContextImpl.proceed(EventContextImpl.java:88) [arquillian-service:]
	at org.jboss.arquillian.core.impl.ManagerImpl.fire(ManagerImpl.java:135) [arquillian-service:]
	at org.jboss.arquillian.test.impl.EventTestRunnerAdaptor.test(EventTestRunnerAdaptor.java:111) [arquillian-service:]
	at org.jboss.arquillian.junit.Arquillian$6.evaluate(Arquillian.java:263) [arquillian-service:]
	at org.jboss.arquillian.junit.Arquillian$4.evaluate(Arquillian.java:226) [arquillian-service:]
	at org.jboss.arquillian.junit.Arquillian.multiExecute(Arquillian.java:314) [arquillian-service:]
	at org.jboss.arquillian.junit.Arquillian.access$100(Arquillian.java:46) [arquillian-service:]
	at org.jboss.arquillian.junit.Arquillian$5.evaluate(Arquillian.java:240) [arquillian-service:]
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271) [arquillian-service:]
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70) [arquillian-service:]
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50) [arquillian-service:]
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238) [arquillian-service:]
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63) [arquillian-service:]
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236) [arquillian-service:]
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53) [arquillian-service:]
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229) [arquillian-service:]
	at org.jboss.arquillian.junit.Arquillian$2.evaluate(Arquillian.java:185) [arquillian-service:]
	at org.jboss.arquillian.junit.Arquillian.multiExecute(Arquillian.java:314) [arquillian-service:]
	at org.jboss.arquillian.junit.Arquillian.access$100(Arquillian.java:46) [arquillian-service:]
	at org.jboss.arquillian.junit.Arquillian$3.evaluate(Arquillian.java:199) [arquillian-service:]
	at org.junit.runners.ParentRunner.run(ParentRunner.java:309) [arquillian-service:]
	at org.jboss.arquillian.junit.Arquillian.run(Arquillian.java:147) [arquillian-service:]
	at org.junit.runner.JUnitCore.run(JUnitCore.java:160) [arquillian-service:]
	at org.junit.runner.JUnitCore.run(JUnitCore.java:138) [arquillian-service:]
	at org.jboss.arquillian.junit.container.JUnitTestRunner.execute(JUnitTestRunner.java:65) [arquillian-service:]
	at org.jboss.arquillian.protocol.jmx.JMXTestRunner.runTestMethodInternal(JMXTestRunner.java:128) [arquillian-service:]
	at org.jboss.arquillian.protocol.jmx.JMXTestRunner.runTestMethod(JMXTestRunner.java:107) [arquillian-service:]
	at org.jboss.as.arquillian.service.ArquillianService$ExtendedJMXTestRunner.runTestMethod(ArquillianService.java:214) [arquillian-service:]
	at sun.reflect.GeneratedMethodAccessor8.invoke(Unknown Source) [:1.7.0.06]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [rt.jar:1.7.0.06]
	at java.lang.reflect.Method.invoke(Method.java:601) [rt.jar:1.7.0.06]
	at com.sun.jmx.mbeanserver.StandardMBeanIntrospector.invokeM2(StandardMBeanIntrospector.java:111) [rt.jar:1.7.0.06]
	at com.sun.jmx.mbeanserver.StandardMBeanIntrospector.invokeM2(StandardMBeanIntrospector.java:45) [rt.jar:1.7.0.06]
	at com.sun.jmx.mbeanserver.MBeanIntrospector.invokeM(MBeanIntrospector.java:235) [rt.jar:1.7.0.06]
	at com.sun.jmx.mbeanserver.PerInterface.invoke(PerInterface.java:138) [rt.jar:1.7.0.06]
	at com.sun.jmx.mbeanserver.MBeanSupport.invoke(MBeanSupport.java:252) [rt.jar:1.7.0.06]
	at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819) [rt.jar:1.7.0.06]
	at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:792) [rt.jar:1.7.0.06]
	at org.jboss.as.jmx.PluggableMBeanServerImpl$TcclMBeanServer.invoke(PluggableMBeanServerImpl.java:1469)
	at org.jboss.as.jmx.PluggableMBeanServerImpl.invoke(PluggableMBeanServerImpl.java:730)
	at org.jboss.remotingjmx.protocol.v2.ServerProxy$InvokeHandler.handle(ServerProxy.java:952)
	at org.jboss.remotingjmx.protocol.v2.ServerCommon$MessageReciever$1$1.run(ServerCommon.java:153)
	at org.jboss.as.jmx.ServerInterceptorFactory$Interceptor$1.run(ServerInterceptorFactory.java:75)
	at org.jboss.as.jmx.ServerInterceptorFactory$Interceptor$1.run(ServerInterceptorFactory.java:70)
	at java.security.AccessController.doPrivileged(Native Method) [rt.jar:1.7.0.06]
	at javax.security.auth.Subject.doAs(Subject.java:415) [rt.jar:1.7.0.06]
	at org.jboss.as.controller.AccessAuditContext.doAs(AccessAuditContext.java:94)
	at org.jboss.as.jmx.ServerInterceptorFactory$Interceptor.handleEvent(ServerInterceptorFactory.java:70)
	at org.jboss.remotingjmx.protocol.v2.ServerCommon$MessageReciever$1.run(ServerCommon.java:149)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [rt.jar:1.7.0.06]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [rt.jar:1.7.0.06]
	at java.lang.Thread.run(Thread.java:722) [rt.jar:1.7.0.06]
Caused by: java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
	at org.jboss.as.naming.subsystem.NamingBindingAdd$2.getReference(NamingBindingAdd.java:257)
	at org.jboss.as.naming.ServiceBasedNamingStore.lookup(ServiceBasedNamingStore.java:139)
	... 102 more
Caused by: java.lang.reflect.InvocationTargetException
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) [rt.jar:1.7.0.06]
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57) [rt.jar:1.7.0.06]
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) [rt.jar:1.7.0.06]
	at java.lang.reflect.Constructor.newInstance(Constructor.java:525) [rt.jar:1.7.0.06]
	at org.jboss.as.naming.ExternalContextObjectFactory.createContext(ExternalContextObjectFactory.java:86)
	at org.jboss.as.naming.ExternalContextObjectFactory.getObjectInstance(ExternalContextObjectFactory.java:51)
	at org.jboss.as.naming.subsystem.NamingBindingAdd$2.getReference(NamingBindingAdd.java:254)
	... 103 more
Caused by: javax.naming.CommunicationException: 10.16.92.191:10389 [Root exception is java.net.ConnectException: Connection refused (errno:239)]
	at com.sun.jndi.ldap.Connection.<init>(Connection.java:224) [rt.jar:1.7.0.06]
	at com.sun.jndi.ldap.LdapClient.<init>(LdapClient.java:136) [rt.jar:1.7.0.06]
	at com.sun.jndi.ldap.LdapClient.getInstance(LdapClient.java:1600) [rt.jar:1.7.0.06]
	at com.sun.jndi.ldap.LdapCtx.connect(LdapCtx.java:2698) [rt.jar:1.7.0.06]
	at com.sun.jndi.ldap.LdapCtx.<init>(LdapCtx.java:316) [rt.jar:1.7.0.06]
	at com.sun.jndi.ldap.LdapCtxFactory.getUsingURL(LdapCtxFactory.java:193) [rt.jar:1.7.0.06]
	at com.sun.jndi.ldap.LdapCtxFactory.getUsingURLs(LdapCtxFactory.java:211) [rt.jar:1.7.0.06]
	at com.sun.jndi.ldap.LdapCtxFactory.getLdapCtxInstance(LdapCtxFactory.java:154) [rt.jar:1.7.0.06]
	at com.sun.jndi.ldap.LdapCtxFactory.getInitialContext(LdapCtxFactory.java:84) [rt.jar:1.7.0.06]
	at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:684) [rt.jar:1.7.0.06]
	at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:307) [rt.jar:1.7.0.06]
	at javax.naming.InitialContext.init(InitialContext.java:242) [rt.jar:1.7.0.06]
	at javax.naming.InitialContext.<init>(InitialContext.java:216) [rt.jar:1.7.0.06]
	at javax.naming.directory.InitialDirContext.<init>(InitialDirContext.java:101) [rt.jar:1.7.0.06]
	... 110 more
Caused by: java.net.ConnectException: Connection refused (errno:239)
	at java.net.PlainSocketImpl.socketConnect(Native Method) [rt.jar:1.7.0.06]
	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339) [rt.jar:1.7.0.06]
	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200) [rt.jar:1.7.0.06]
	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182) [rt.jar:1.7.0.06]
	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:391) [rt.jar:1.7.0.06]
	at java.net.Socket.connect(Socket.java:589) [rt.jar:1.7.0.06]
	at java.net.Socket.connect(Socket.java:538) [rt.jar:1.7.0.06]
	at java.net.Socket.<init>(Socket.java:424) [rt.jar:1.7.0.06]
	at java.net.Socket.<init>(Socket.java:208) [rt.jar:1.7.0.06]
	at com.sun.jndi.ldap.Connection.createSocket(Connection.java:366) [rt.jar:1.7.0.06]
	at com.sun.jndi.ldap.Connection.<init>(Connection.java:201) [rt.jar:1.7.0.06]
	... 123 more