In my logfile I have found this: Aug 12 01:30:47 dns named[15787]: [ID 873579 daemon.crit] rbtdb.c:3052: INSIST(node->references > 0) failed Aug 12 01:30:47 dns named[15787]: [ID 873579 daemon.crit] exiting (due to assertion failure) What is it? Is it problem with hardware or software ? -marg