Turn off failureCheckAndFlushThread when freezing the connections.

Also remove a duplicate check on "started" at stop().

hornetq-server/src/main/java/org/hornetq/core/remoting/server/impl/RemotingServiceImpl.java

@@ -278,6 +278,10 @@ public synchronized void allowInvmSecurityOverride(HornetQPrincipal principal)
 
    public synchronized void freeze(final CoreRemotingConnection connectionToKeepOpen)
    {
+      if (!started)
+         return;
+      failureCheckAndFlushThread.close(false);
+
       for (Acceptor acceptor : acceptors)
       {
          try
@@ -321,11 +325,6 @@ public void stop(final boolean criticalError) throws Exception
          return;
       }
 
-      if (!started)
-      {
-         return;
-      }
-
       failureCheckAndFlushThread.close(criticalError);
 
       // We need to stop them accepting first so no new connections are accepted after we send the disconnect message