When I run Netdiag on my Exchange 2003 server in my Windows 2003 AD I get the following. Any ideas? Kerberos test. . . . . . . . . . . : Failed [FATAL] Cannot get ticket cache from Kerberos. The error occurred was: (null) LDAP test. . . . . . . . . . . . . : Failed [WARNING] The default SPN registration for 'HOST/exchange.domain.com' is missing on DC 'accounting.domain.com'. [WARNING] The default SPN registration for 'HOST/exchange.domain.com' is missing on DC 'Aspen.domain.com'. [WARNING] The default SPN registration for 'HOST/exchange.domain.com' is missing on DC 'Seattledc.domain.com'. [FATAL] The default SPNs are not properly registered on any DCs. Thanks, Bob