title: WSO2 ESB too many open files
body: <p>We have a problem in our installation of wso2 esb.</p>
  
  <p>We have only 4 proxy services configured, after one month without problems we started to have the following error:</p>
  
  <pre><code>2013-10-02 09:29:09,366 [-] [PassThroughHTTPSListener]  WARN PassThroughHttpSSLListener System may be unstable: HTTPS ListeningIOReactor encountered a checked exception : Too many open files
  java.io.IOException: Too many open files
  at sun.nio.ch.ServerSocketChannelImpl.accept0(Native Method)
  at sun.nio.ch.ServerSocketChannelImpl.accept(ServerSocketChannelImpl.java:189)
  at org.apache.http.impl.nio.reactor.DefaultListeningIOReactor.processEvent(DefaultListeningIOReactor.java:129)
  at org.apache.http.impl.nio.reactor.DefaultListeningIOReactor.processEvents(DefaultListeningIOReactor.java:113)
  at org.apache.http.impl.nio.reactor.AbstractMultiworkerIOReactor.execute(AbstractMultiworkerIOReactor.java:313)
  at org.apache.synapse.transport.passthru.PassThroughHttpListener$2.run(PassThroughHttpListener.java:180)
  at java.lang.Thread.run(Thread.java:738)
  </code></pre>
  
  <p>If I list the list of files open by java, I will see hundreds of:</p>
  
  <pre><code>java      3906       root  150u     sock                0,7         0t0       9928 can't identify protocol
  java      3906       root  151u     sock                0,7         0t0      10004 can't identify protocol
  </code></pre>
  
  <p>Someone could point me out the cause of this error?</p>
  
  <p>Thank you.</p>