javax.naming.CommunicationException: LDAP response read timed out, timeout used: 2958 ms. [Root exception is java.io.IOException: LDAP response read timed out, timeout used: 2958 ms.]
at java.naming/com.sun.jndi.ldap.Connection.readReply(Connection.java:468)
at java.naming/com.sun.jndi.ldap.LdapClient.ldapBind(LdapClient.java:368)
at java.naming/com.sun.jndi.ldap.LdapClient.authenticate(LdapClient.java:195)
at java.naming/com.sun.jndi.ldap.LdapCtx.connect(LdapCtx.java:2895)
at java.naming/com.sun.jndi.ldap.LdapCtx.<init>(LdapCtx.java:348)
at java.naming/com.sun.jndi.ldap.LdapCtxFactory.getLdapCtxFromUrl(LdapCtxFactory.java:225)
at java.naming/com.sun.jndi.ldap.LdapCtxFactory.getUsingURL(LdapCtxFactory.java:189)
at java.naming/com.sun.jndi.ldap.LdapCtxFactory.getUsingURLs(LdapCtxFactory.java:243)
at java.naming/com.sun.jndi.ldap.LdapCtxFactory.getLdapCtxInstance(LdapCtxFactory.java:154)
at java.naming/com.sun.jndi.ldap.LdapCtxFactory.getInitialContext(LdapCtxFactory.java:84)
at java.naming/javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:732)
at java.naming/javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:305)
at java.naming/javax.naming.InitialContext.init(InitialContext.java:236)
at java.naming/javax.naming.InitialContext.<init>(InitialContext.java:208)
at java.naming/javax.naming.directory.InitialDirContext.<init>(InitialDirContext.java:130)
at LdapPoolTimeoutTest.lambda$attemptConnect$8(LdapPoolTimeoutTest.java:119)
at LdapTimeoutTest.lambda$assertCompletion$18(LdapTimeoutTest.java:361)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at java.base/java.lang.Thread.run(Thread.java:828)
Caused by: java.io.IOException: LDAP response read timed out, timeout used: 2958 ms.
at java.naming/com.sun.jndi.ldap.LdapRequest.getReplyBer(LdapRequest.java:129)
at java.naming/com.sun.jndi.ldap.Connection.readReply(Connection.java:444)
... 18 more

This cause message is none of the following pre-defined messages in this test,
Network is unreachable
Timed out waiting for lock
Connect timed out
Timeout exceeded while waiting for a connection