11:40 a.m.
I am having a frustrating time trying to figure out what is going on with these Ubuntu
servers. I have tried to use msktutil as some have suggested, but this hasn't worked
for me. Every 7 days on the mark I lose my domain connection and have to run realm
leave/realm join again. I ran msktutil the day before the ticket was about to expire, so
it should have worked. This is only a problem on Ubuntu, CentOS works perfectly fine. I
even have one Ubuntu server that works.
I also have the problem that the sssd init script, wherever that is now, sometimes thinks
that sssd is still running and won't start again. I then have to run 'sssd -D'
if I don't want to restart the server.
This is what I get running msktutil.
msktutil --auto-update --verbose:
-- init_password: Wiping the computer password structure
-- generate_new_password: Generating a new, random password for the computer account
-- generate_new_password: Characters read from /dev/udandom = 86
-- get_dc_host: Attempting to find a Domain Controller to use (DNS SRV RR TCP)
-- get_dc_host: Found DC: udc05.ad.mydomain.com
-- get_dc_host: Canonicalizing DC through forward/reverse lookup...
-- get_dc_host: Found Domain Controller: udc05.ad.mydomain.com
-- get_default_keytab: Obtaining the default keytab name: FILE:/etc/krb5.keytab
-- create_fake_krb5_conf: Created a fake krb5.conf file: /tmp/.msktkrb5.conf-TSzpEQ
-- reload: Reloading Kerberos Context
-- get_short_hostname: Determined short hostname: myserver-domain-foo-com
Error: The SAM name (myserver-domain-foo-com$) for this host is longer than the maximum of
MAX_SAM_ACCOUNT_LEN characters
You can specify a shorter name using --computer-name
-- ~KRB5Context: Destroying Kerberos Context
This appears to have worked, but it didn't.
msktutil --update --computer-name MYSERVER --verbose:
-- init_password: Wiping the computer password structure
-- generate_new_password: Generating a new, random password for the computer account
-- generate_new_password: Characters read from /dev/udandom = 82
-- get_dc_host: Attempting to find a Domain Controller to use (DNS SRV RR TCP)
-- get_dc_host: Found DC: udc05.ad.mydomain.com
-- get_dc_host: Canonicalizing DC through forward/reverse lookup...
-- get_dc_host: Found Domain Controller: udc05.ad.mydomain.com
-- get_default_keytab: Obtaining the default keytab name: FILE:/etc/krb5.keytab
-- create_fake_krb5_conf: Created a fake krb5.conf file: /tmp/.msktkrb5.conf-ozv4A6
-- reload: Reloading Kerberos Context
-- finalize_exec: SAM Account Name is: MYSERVER$
-- try_machine_keytab_princ: Trying to authenticate for MYSERVER$ from local keytab...
-- switch_default_ccache: Using the local credential cache:
FILE:/tmp/.mskt_krb5_ccache-ewj6uW
-- finalize_exec: Authenticated using method 1
-- ldap_connect: Connecting to LDAP server: udc05.ad.mydomain.com try_tls=YES
-- ldap_connect: Connecting to LDAP server: udc05.ad.mydomain.com try_tls=NO
SASL/GSSAPI authentication started
SASL username: MYSERVER$(a)AD.MYDOMAIN.COM
SASL SSF: 56
SASL data security layer installed.
-- ldap_connect: LDAP_OPT_X_SASL_SSF=56
This is what I think is the pertinent portions of the logs from when the computer cant
connect anymore.
sssd_ad.mydomain.com.log:
(Wed Nov 4 15:26:09 2015) [sssd[be[ad.mydomain.com]]] [sdap_get_tgt_recv] (0x0400): Child
responded: 14 [Preauthentication failed], expired on [0]
(Wed Nov 4 15:26:09 2015) [sssd[be[ad.mydomain.com]]] [sdap_kinit_done] (0x0100): Could
not get TGT: 14 [Bad address]
(Wed Nov 4 15:26:09 2015) [sssd[be[ad.mydomain.com]]] [sdap_cli_kinit_done] (0x0400):
Cannot get a TGT: ret [1432158219](Authentication Failed)
(Wed Nov 4 15:26:09 2015) [sssd[be[ad.mydomain.com]]] [fo_set_port_status] (0x0100):
Marking port 389 of server 'udc02.ad.mydomain.com' as 'not working'
(Wed Nov 4 15:26:09 2015) [sssd[be[ad.mydomain.com]]] [ad_user_data_cmp] (0x1000):
Comparing LDAP with LDAP
(Wed Nov 4 15:26:09 2015) [sssd[be[ad.mydomain.com]]] [fo_set_port_status] (0x0400):
Marking port 389 of duplicate server 'udc02.ad.mydomain.com' as 'not
working'
syslog:
Nov 4 15:26:09 myserver [sssd[ldap_child[25833]]]: Failed to initialize credentials using
keytab [MEMORY:/etc/krb5.keytab]: Preauthentication failed. Unable to create
GSSAPI-encrypted LDAP connection.
Nov 4 15:26:09 myserver [sssd[ldap_child[25833]]]: Preauthentication failed
Any help is appreciated.