Apache 2.2 mod_auth_kerb SSO перестала работать

У меня нет идей, почему он просто перестал работать, вот что я проверил:

httpd-error.log:

[Thu Jun 11 18:04:21 2015] [debug] src/mod_auth_kerb.c(1758): [client 10.105.5.131] kerb_authenticate_user entered with user (NULL) and auth_type Kerberos
[Thu Jun 11 18:04:21 2015] [debug] src/mod_auth_kerb.c(1758): [client 10.105.5.131] kerb_authenticate_user entered with user (NULL) and auth_type Kerberos
[Thu Jun 11 18:04:21 2015] [debug] src/mod_auth_kerb.c(1264): [client 10.105.5.131] Acquiring creds for HTTP/<FQDN>@<LOCAL.DOMAIN>
[Thu Jun 11 18:04:21 2015] [debug] src/mod_auth_kerb.c(1411): [client 10.105.5.131] Verifying client data using KRB5 GSS-API
[Thu Jun 11 18:04:21 2015] [debug] src/mod_auth_kerb.c(1427): [client 10.105.5.131] Client didn't delegate us their credential
[Thu Jun 11 18:04:21 2015] [debug] src/mod_auth_kerb.c(1446): [client 10.105.5.131] GSS-API token of length 22 bytes will be sent back
[Thu Jun 11 18:04:21 2015] [debug] src/mod_auth_kerb.c(1758): [client 10.105.5.131] kerb_authenticate_user entered with user (NULL) and auth_type Kerberos
[Thu Jun 11 18:04:21 2015] [debug] src/mod_auth_kerb.c(1264): [client 10.105.5.131] Acquiring creds for HTTP/<FQDN>@<LOCAL.DOMAIN>
[Thu Jun 11 18:04:21 2015] [debug] src/mod_auth_kerb.c(1411): [client 10.105.5.131] Verifying client data using KRB5 GSS-API
[Thu Jun 11 18:04:21 2015] [debug] src/mod_auth_kerb.c(1427): [client 10.105.5.131] Client didn't delegate us their credential
[Thu Jun 11 18:04:21 2015] [debug] src/mod_auth_kerb.c(1125): [client 10.105.5.131] GSS-API major_status:00090000, minor_status:00000000

-

sudo kinit -t /etc/krb5.keytab HTTP/<FQDN> 

работает нормально, ошибок нет

sudo klist:

Credentials cache: FILE:/tmp/krb5cc_0
    Principal: HTTP/<FQDN>@<LOCAL.DOMAIN>

Issued                Expires               Principal
Jun 11 17:21:58 2015  Jun 12 00:01:57 2015  krbtgt/<LOCAL.DOMAIN>@<LOCAL.DOMAIN>

krb5.conf

[libdefaults]
 ticket_lifetime = 24000
 default_realm = <LOCAL.DOMAIN>
 dns_lookup_realm = false
 dns_lookup_kdc = false
 default_keytab_name = /etc/krb5.keytab
 rdns = false

[realms]
 KC.KPLUS = {
  kdc = <dc.ip>:88
  admin_server = <dc.ip>:88
  default_domain = <LOCAL.DOMAIN>
 }

[domain_realm]
 .<local.domain> = <LOCAL.DOMAIN>
 <local.domain> = <LOCAL.DOMAIN>



[appdefaults]
 pam = {
   debug = false
   ticket_lifetime = 36000
   renew_lifetime = 36000
   forwardable = true
   krb4_convert = false
 }

.htaccess

AddHandler cgi-script .cgi .pl
Options +ExecCGI
DirectoryIndex index.pl
AuthName "<LOCAL.DOMAIN>"
AuthType Kerberos
Krb5Keytab /etc/krb5.keytab
KrbAuthRealm <LOCAL.DOMAIN>
KrbMethodNegotiate on
KrbServiceName HTTP/<FQDN>@<LOCAL.DOMAIN>
KrbMethodK5Passwd off
KrbSaveCredentials on
KrbVerifyKDC off
Require valid-user

Проверил трафик на стороне клиента, видимо запускает Negotiate, соглашается на мех KRB5 и отправляет тикет. В результате получает 401.

Я не могу понять, что здесь не так, любые идеи приветствуются.