I have an issue trying to do a kinit on ubuntu 22.04 with a user that has the "This account supports Kerberos AES 256 bit encryption" checkmark set.
I can kinit without issues to a user that does not have this checkmark set just fine, and weirdly enough, klist shows AES256 as encryption type even for this user:
~ % klist -e Ticketzwischenspeicher: FILE:/... Standard-Principal: user1@REALM... Valid starting Expires Service principal 11.01.2023 12:13:58 11.01.2023 16:13:58 krbtgt/REALM@REALM erneuern bis 11.01.2023 16:13:58, Etype (Skey, TKT): aes256-cts-hmac-sha1-96, aes256-cts-hmac-sha1-96
but once I set the checkmark on the user in AD to force AES265 bit encryption, the kinit fails with "KDC has no support for encryption type"
Also doesn't work manually with ktutil:
ktutil: addent -password -p user2@REALM -k 1 -e aes256-cts-hmac-sha1-96 -f Passwort für user2@REALM: addent: KDC has no support for encryption type beim Hinzufügen eines neuen Eintrags
I tried adding to /etc/krb5.conf the default encryptes:
[libdefaults] default_realm = REALM default_keytab_name = /etc/krb5.keytab forwardable = true proxiable = true default_tkt_enctypes = aes256-cts aes128-cts des-cbc-md5 des-cbc-crc default_tgs_enctypes = aes256-cts aes128-cts des-cbc-md5 des-cbc-crc permitted_enctypes = aes256-cts aes128-cts des-cbc-md5 des-cbc-crc
but no change.
Setting the "Do not require Kerberos preauthentication" checkmark to the account doesn't change anything
Manually forcing AES256 on a user WITHOUT the checkmarks works fine as well:
ktutil: addent -password -p user1@REALM -k 1 -e aes256-cts-hmac-sha1-96 -f Passwort für user1@REALM: ktutil:
But as soon as I set the checkmark to that user, it's broken again.
krbtgtservice, not for the user. How old is the user's password? Have you tried changing the password to make sure the DC stores AES keys for it?