APM hangs sometimes

Hi,

We're evaluating APM on linux and get hangs.. the procesess are running and I can see this log:

16 Sep 2010 16:37:35:199 Caused by: java.net.SocketException: Too many open files
16 Sep 2010 16:37:35:199        at java.net.Socket.createImpl(Unknown Source)
16 Sep 2010 16:37:35:199        at java.net.Socket.connect(Unknown Source)
16 Sep 2010 16:37:35:199        at com.ibm.db2.jcc.b.bb.run(bb.java:34)
16 Sep 2010 16:37:35:199        at java.security.AccessController.doPrivileged(Native Method)
16 Sep 2010 16:37:35:199        at com.ibm.db2.jcc.b.yb.a(yb.java:369)
16 Sep 2010 16:37:35:199        ... 8 more
16 Sep 2010 16:38:02:295 java.net.SocketException: Too many open files
16 Sep 2010 16:38:02:296        at java.net.Socket.createImpl(Unknown Source)
16 Sep 2010 16:38:02:296        at java.net.Socket.connect(Unknown Source)
16 Sep 2010 16:38:02:296        at com.adventnet.appmanager.server.hostresources.datacollection.HostResourceMonitor.testPort(HostResourceMonitor.java:6196)

I restarted and everything is fine now!

Any idea?
Thanks