Every few days I need to restart hudson due to sockets not being closed by Hudson and being left in the CLOSE_WAIT state. The log reports:

Oct 6, 2010 12:13:51 PM org.apache.commons.httpclient.HttpMethodDirector executeWithRetry
INFO: I/O exception (java.net.SocketException) caught when processing request: Too many open files
Oct 6, 2010 12:13:51 PM org.apache.commons.httpclient.HttpMethodDirector executeWithRetry
INFO: Retrying request
Oct 6, 2010 12:13:51 PM org.apache.commons.httpclient.HttpMethodDirector executeWithRetry
INFO: I/O exception (java.net.SocketException) caught when processing request: Too many open files
Oct 6, 2010 12:13:51 PM org.apache.commons.httpclient.HttpMethodDirector executeWithRetry
INFO: Retrying request
Oct 6, 2010 12:14:07 PM org.apache.commons.httpclient.HttpMethodDirector executeWithRetry
INFO: I/O exception (java.net.SocketException) caught when processing request: Too many open files
Oct 6, 2010 12:14:07 PM org.apache.commons.httpclient.HttpMethodDirector executeWithRetry
INFO: Retrying request
Oct 6, 2010 12:14:07 PM org.apache.commons.httpclient.HttpMethodDirector executeWithRetry
INFO: I/O exception (java.net.SocketException) caught when processing request: Too many open files
Oct 6, 2010 12:14:07 PM org.apache.commons.httpclient.HttpMethodDirector executeWithRetry
INFO: Retrying request
Oct 6, 2010 12:14:07 PM org.apache.commons.httpclient.HttpMethodDirector executeWithRetry
INFO: I/O exception (java.net.SocketException) caught when processing request: Too many open files