EAP 6 consistently fails to join with httpd 2.4 mod_cluster balancer

Issue

• EAP 6 consistently fails to join our mod_cluster balancer running on httpd 2.4. It never gets past the INFO request, which always fails with the following:

INFO  [org.jboss.modcluster.mcmp.impl.DefaultMCMPHandler] (ServerService Thread Pool -- 54) IO error sending command INFO to proxy localhost/127.0.0.1:6666: java.net.SocketTimeoutException: Read timed out
    at java.net.SocketInputStream.socketRead0(Native Method) [rt.jar:1.7.0_21]
    at java.net.SocketInputStream.read(SocketInputStream.java:150) [rt.jar:1.7.0_21]
    at java.net.SocketInputStream.read(SocketInputStream.java:121) [rt.jar:1.7.0_21]
    at sun.nio.cs.StreamDecoder.readBytes(StreamDecoder.java:283) [rt.jar:1.7.0_21]
    at sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:325) [rt.jar:1.7.0_21]
    at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:177) [rt.jar:1.7.0_21]
    at java.io.InputStreamReader.read(InputStreamReader.java:184) [rt.jar:1.7.0_21]
    at java.io.BufferedReader.fill(BufferedReader.java:154) [rt.jar:1.7.0_21]
    at java.io.BufferedReader.readLine(BufferedReader.java:317) [rt.jar:1.7.0_21]
    at java.io.BufferedReader.readLine(BufferedReader.java:382) [rt.jar:1.7.0_21]
    at org.jboss.modcluster.mcmp.impl.DefaultMCMPHandler.sendRequest(DefaultMCMPHandler.java:670)
    at org.jboss.modcluster.mcmp.impl.DefaultMCMPHandler.status(DefaultMCMPHandler.java:369)
    at org.jboss.modcluster.mcmp.impl.DefaultMCMPHandler.status(DefaultMCMPHandler.java:349)
    at org.jboss.modcluster.ModClusterService.status(ModClusterService.java:468)
    at org.jboss.as.modcluster.ModClusterService.start(ModClusterService.java:116)
    at org.jboss.as.clustering.msc.AsynchronousService$1.run(AsynchronousService.java:82) [jboss-as-clustering-common-7.1.3.Final-redhat-4.jar:7.1.3.Final-redhat-4]
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [rt.jar:1.7.0_21]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [rt.jar:1.7.0_21]
    at java.lang.Thread.run(Thread.java:722) [rt.jar:1.7.0_21]
    at org.jboss.threads.JBossThread.run(JBossThread.java:122) [jboss-threads-2.0.0.GA-redhat-2.jar:2.0.0.GA-redhat-2]