Just a thought... Have you installed the post service pack 2 rollup? If you did, have you install the patch for the problems it created? On 27 Feb 2002 at 14:52, John Valenti wrote: > No, I haven't changed or even looked at the security settings > since early December. I am getting occasional messages about > duplicate IP addresses, but they don't show a pattern. (and the > affected systems all use DHCP, shouldn't really be duplicated) I > wonder if the NIC is corrupting packets?