Hi there, clients are having trouble with kerberos authentication:

$ kinit -V user
Using existing cache: xxxxxxxxxx:yyyyy
Using principal: user@SUB.EXAMPLE.COM
Password for user@SUB.EXAMPLE.COM:
kinit: Generic error (see e-text) while getting initial credentials

On the ipa server, /var/log/krb5kdc.log says:

Dec 24 14:40:34 ipa01.sub.example.com krb5kdc[3324](info): AS_REQ (6 etypes {aes256-cts-hmac-sha384-192(20), aes128-cts-hmac-sha256-128(19), aes256-cts-hmac-sha1-96(18), aes128-cts-hmac-sha1-96(17), camellia256-cts-cmac(26), camellia128-cts-cmac(25)}) <IP>: NEEDED_PREAUTH: user@SUB.EXAMPLE.COM for krbtgt/SUB.EXAMPLE.COM@SUB.EXAMPLE.COM, Additional pre-authentication required
Dec 24 14:40:34 ipa01.sub.example.com krb5kdc[3324](info): closing down fd 11
Dec 24 14:40:51 ipa01.sub.example.com krb5kdc[3324](info): AS_REQ : handle_authdata (2)
Dec 24 14:40:51 ipa01.sub.example.com krb5kdc[3324](info): AS_REQ (6 etypes {aes256-cts-hmac-sha384-192(20), aes128-cts-hmac-sha256-128(19), aes256-cts-hmac-sha1-96(18), aes128-cts-hmac-sha1-96(17), camellia256-cts-cmac(26), camellia128-cts-cmac(25)}) 
<IP>: HANDLE_AUTHDATA: user@SUB.EXAMPLE.COM for krbtgt/SUB.EXAMPLE.COM@SUB.EXAMPLE.COM, No such file or directory
Dec 24 14:40:51 ipa01.sub.example.com krb5kdc[3324](info): closing down fd 11
Dec 24 14:40:57 ipa01.sub.example.com krb5kdc[3324](info): AS_REQ (4 etypes {aes256-cts-hmac-sha1-96(18), aes128-cts-hmac-sha1-96(17), aes256-cts-hmac-sha384-192(20), aes128-cts-hmac-sha256-128(19)}) <IP>: NEEDED_PREAUTH: ldap/ipa01.sub.example.com@SUB.EXAMPLE.COM for krbtgt/SUB.EXAMPLE.COM@SUB.EXAMPLE.COM, Additional pre-authentication required
Dec 24 14:40:57 ipa01.sub.example.com krb5kdc[3324](info): closing down fd 11
Dec 24 14:40:57 ipa01.sub.example.com krb5kdc[3324](info): AS_REQ (4 etypes {aes256-cts-hmac-sha1-96(18), aes128-cts-hmac-sha1-96(17), aes256-cts-hmac-sha384-192(20), aes128-cts-hmac-sha256-128(19)}) 
<IP>: ISSUE: authtime 1703425257, etypes {rep=aes256-cts-hmac-sha1-96(18), tkt=aes256-cts-hmac-sha1-96(18), ses=aes256-cts-hmac-sha1-96(18)}, ldap/ipa01.sub.example.com@SUB.EXAMPLE.COM for krbtgt/SUB.EXAMPLE.COM@SUB.EXAMPLE.COM
Dec 24 14:40:57 ipa01.sub.example.com krb5kdc[3324](info): closing down fd 11
Dec 24 14:40:57 ipa01.sub.example.com krb5kdc[3324](info): TGS_REQ (4 etypes {aes256-cts-hmac-sha384-192(20), aes128-cts-hmac-sha256-128(19), aes256-cts-hmac-sha1-96(18), aes128-cts-hmac-sha1-96(17)}) 
<IP>: ISSUE: authtime 1703425257, etypes {rep=aes256-cts-hmac-sha1-96(18), tkt=aes256-cts-hmac-sha1-96(18), ses=aes256-cts-hmac-sha1-96(18)}, ldap/ipa01.sub.example.com@SUB.EXAMPLE.COM for ldap/ipa02.sub.example.com@SUB.EXAMPLE.COM
Dec 24 14:40:57 ipa01.sub.example.com krb5kdc[3324](info): closing down fd 11

There are 2 ipa servers, ipa01 (Rocky 9.3, ipa 4.10.2) and ipa02 (Rock 9.1, ipa4.10.0), both with CA and DNS. ipa02 is CRL master.
On both, ipa-healthcheck doesn't find any issue.

Also: kinit fails from within ipa01, succeeds from within ipa02.

The issue seems to be in ipa01, and I have already tried to reinstall it from scratch. One thing that is different is the version.

Could you please help me figure out what's wrong?

Best regards,
Roberto