Ubuntu 16.04.03 kinit: Improper format of Kerberos configuration file while initializing Kerberos 5 library

I'm trying to join Ubuntu Server 16.04.3 (fresh install) join to AD follow the guide https://www.starwindsoftware.com/blog/ubuntu-join-a-server-to-an-active-directory-domain

The /etc/krb5.conf contant is following:

[libdefaults]
ticket_lifetime = 24000
default_realm = mydomain.local
default_tgs_entypes = rc4-hmac des-cbc-md5
default_tkt__enctypes = rc4-hmac des-cbc-md5
permitted_enctypes = rc4-hmac des-cbc-md5
dns_lookup_realm = true
dns_lookup_kdc = true
dns_fallback = yes

[realms]
mydomain.local = {
  kdc = pdc.mydomain.local
  kdc = sdc.mydomain.local
  default_domain = pdc.mydomain.local
}

[domain_realm]
.mydomain.local = pdc.mydomain.local
mydomain.local = pdc.mydomain.local

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

[logging]
default = FILE:/var/log/krb5libs.log
kdc = FILE:/var/log/krb5kdc.log
admin_server = FILE:/var/log/kadmind.log

Running sudo kinit domainuser I recieve the error: kinit: Improper format of Kerberos configuration file while initializing Kerberos 5 library. Googling I found CentOS7 Kerberos Auth: Improper format of Kerberos configuration file; . I have already checked the /etc/krb5.conf syntax which has no mistakes.

Solution 1:

Perhaps a simpler config for troubleshooting? (Also, pay attention to the capitalization, it is very important even though it may look arbitrary.)

[libdefaults]
  default_realm = MYDOMAIN.LOCAL
  ticket_lifetime = 24h
  renew_lifetime = 7d
  dns_lookup_realm = false

[realms]
MYDOMAIN.LOCAL = {
  kdc = pdc.mydomain.local
  kdc = sdc.mydomain.local
}

[domain_realm]
mydomain.local = MYDOMAIN.LOCAL
.mydomain.local = MYDOMAIN.LOCAL

[logging]
default = FILE:/var/log/krb5libs.log
kdc = FILE:/var/log/krb5kdc.log
admin_server = FILE:/var/log/kadmind.log

If this works, you can start adding the other settings back until something breaks.

Solution 2:

I think you are missing a 'c'. You have default_tgs_entypes instead of default_tgs_enctypes.