I have inherited a 2003 domain that was migrated from SBS. At present the domain has 2 DC's one of which is also an exchange server. I am in the process of introducing 2 new DC's to replace the exisiting two but on the new DC I have put in, on reboot I get KDC error event id: 7
The Security Account Manager failed a KDC request in an unexpected way. The error is in the data field. The account name was <computer name> and lookup type 0x8.
Other than that this is not logged, only on reboot.