A similar problem seems to have come back where jobs are not processing on the slave...
running the script manually, the slave complains it cannot connect to the master:
25.10.2012-00:45 - DEBUG - Set Lock: /usr/local/ispconfig/server/temp/.ispconfig_lock
25.10.2012-00:45 - WARNING - Unable to connect to master server.
25.10.2012-00:45 - DEBUG - No Updated records found, starting only the core.
25.10.2012-00:45 - DEBUG - Remove Lock: /usr/local/ispconfig/server/temp/.ispconfig_lock