title: Apache/mod_jk module fail to connect jboss after running some time
body: <p>I use <a href="http://tomcat.apache.org/download-connectors.cgi" rel="nofollow noreferrer">Apache/mod_jk module</a> to connect jboss. But after running some time, something goes wrong . </p>
  
  <p>Apache:  2.2.22
  mod_jk: 1.2.37
  Jboss: 5.1.0 GA(cluster environment)
  OS: CentOS 5.2 x86_64
  JDK: 1.6.0_30-b12</p>
  
  <p>Here is some part of mod_jk.log</p>
  
  <pre><code>[Thu Oct 18 15:21:35.044 2012] [26272:47208100643936] [error] ajp_connect_to_endpoint::jk_ajp_common.c (1035): (node1) cping/cpong after connecting to the backend server failed (errno=110)
  [Thu Oct 18 15:21:35.044 2012] [26272:47208100643936] [error] ajp_send_request::jk_ajp_common.c (1630): (node1) connecting to backend failed. Tomcat is probably not started or is listening on the wrong port (errno=110)
  [Thu Oct 18 15:22:35.643 2012] [26272:47208100643936] [error] ajp_connect_to_endpoint::jk_ajp_common.c (1035): (node1) cping/cpong after connecting to the backend server failed (errno=110)
  [Thu Oct 18 15:22:35.643 2012] [26272:47208100643936] [error] ajp_send_request::jk_ajp_common.c (1630): (node1) connecting to backend failed. Tomcat is probably not started or is listening on the wrong port (errno=110)
  [Thu Oct 18 15:22:35.643 2012] [26272:47208100643936] [error] ajp_service::jk_ajp_common.c (2626): (node1) connecting to tomcat failed.
  [Thu Oct 18 15:23:36.143 2012] [26272:47208100643936] [error] ajp_connect_to_endpoint::jk_ajp_common.c (1035): (node2) cping/cpong after connecting to the backend server failed (errno=110)
  [Thu Oct 18 15:23:36.143 2012] [26272:47208100643936] [error] ajp_send_request::jk_ajp_common.c (1630): (node2) connecting to backend failed. Tomcat is probably not started or is listening on the wrong port (errno=110)
  [Thu Oct 18 15:24:36.742 2012] [26272:47208100643936] [error] ajp_connect_to_endpoint::jk_ajp_common.c (1035): (node2) cping/cpong after connecting to the backend server failed (errno=110)
  [Thu Oct 18 15:24:36.742 2012] [26272:47208100643936] [error] ajp_send_request::jk_ajp_common.c (1630): (node2) connecting to backend failed. Tomcat is probably not started or is listening on the wrong port (errno=110)
  [Thu Oct 18 15:24:36.742 2012] [26272:47208100643936] [error] ajp_service::jk_ajp_common.c (2626): (node2) connecting to tomcat failed.
  [Thu Oct 18 15:24:36.742 2012] [26272:47208100643936] [error] service::jk_lb_worker.c (1485): All tomcat instances failed, no more workers left
  </code></pre>
  
  <p>part of http.conf:</p>
  
  <pre><code>JkWorkersFile conf/workers.properties
  JkMountFile conf/uriworkermap.properties
  JkLogFile logs/mod_jk.log
  JkLogLevel warn
  </code></pre>
  
  <p>workers.properties:</p>
  
  <pre><code> worker.list=loadbalancer,loadbalancer_2,status
   worker.node1.port=8009
   worker.node1.host=10.123.76.6
   worker.node1.type=ajp13
   worker.node1.lbfactor=1
  
   worker.node2.port=8009
   worker.node2.host=10.123.76.4
   worker.node2.type=ajp13
   worker.node2.lbfactor=1
  
   worker.loadbalancer.type=lb
   worker.loadbalancer.balance_workers=node1,node2
  
   worker.loadbalancer.sticky_session=true
   worker.loadbalancer.sticky_session_force=false
  
   worker.loadbalancer_2.type=lb
   worker.loadbalancer_2.balance_workers=node1,node2
   worker.loadbalancer_2.sticky_session=true
   worker.loadbalancer_2.sticky_session_force=false
  </code></pre>
  
  <p><strong>Attentions</strong>: Jboss is working fine.  <code>telnet</code> jboss <code>8009</code> is normal. If you restart jboss, it works again. But if you restart apache, it doesn't help。</p>
  
  <p>Anyone has ever encounter this problem ? </p>