No Kerberos for AFP

Kerberos will not work for AFP, but does for other services. All was working fine before a reboot last week. I have tried everything I can think of, including: Unbind from AD Delete keytab file Delete /Library/Preferences/Directory Services/ Delete /Library/Preferences/edu.mit.kerberos Rebind to AD run sudo dsconfigad -enableSSO Checked serveradmin settings afp:kerberosPrincipal, all looks good. Also, no recent DNS server changes. xserve G5, 10.4.11 Any suggestions?