KDC - key distribution center - belongs to domain
Timesync is very important for Kerberos authentication
kerbtray.exe clean ticket cache - from resource kit
Kerberos KDC - port 88
SPN - service principal name
To check SPN for a service use ADSI Edit and go to the object and property and EDIT "servicePrincipalName"
to enable index on database migrated from 2000 to 2005 run