Squid3 mit Domänen Authentifizierung - Client not found in Kerberos Database

[libdefaults]
        default_realm = SQUIRRELCUBE.COM
        dns_lookup_kdc = no
        dns_lookup_realm = no
        ticket_lifetime = 24h
        default_keytab_name = /etc/squid3/PROXY.keytab

[realms]
        SQUIRRELCUBE.COM = {
                kdc = e752.squirrelcube.com
                admin_server = e752.squirrelcube.com
                default_domain = squirrelcube.com
        }

[domain_realm]
        .squirrelcube.com = SQUIRRELCUBE.COM
        squirrelcube.com = SQUIRRELCUBE.COM

 msktutil -c -b "ou=Server" -s HTTP/deprox.squirrelcube.com -k /etc/squid3/PROXY.keytab \--computer-name deprox-http --upn HTTP/deprox.squirrelcube.com --server e752.squirrelcube.com --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
 -- create_fake_krb5_conf: Created a fake krb5.conf file: /tmp/.msktkrb5.conf-vPLCyz
 -- reload: Reloading Kerberos Context
 -- finalize_exec: SAM Account Name is: deprox-http$
 -- try_machine_keytab_princ: Trying to authenticate for deprox-http$ from local keytab...
 -- try_machine_keytab_princ: Error: krb5_get_init_creds_keytab failed (Client not found in Kerberos database)
 -- try_machine_keytab_princ: Authentication with keytab failed
 -- try_machine_keytab_princ: Trying to authenticate for host/deprox.squirrelcube.com from local keytab...
 -- try_machine_keytab_princ: Error: krb5_get_init_creds_keytab failed (Client not found in Kerberos database)
 -- try_machine_keytab_princ: Authentication with keytab failed
 -- try_machine_password: Trying to authenticate for deprox-http$ with password.
 -- create_default_machine_password: Default machine password for deprox-http$ is deprox-http
 -- try_machine_password: Error: krb5_get_init_creds_keytab failed (Client not found in Kerberos database)
 -- try_machine_password: Authentication with password failed
 -- try_user_creds: Checking if default ticket cache has tickets...
 -- finalize_exec: Authenticated using method 4

 -- ldap_connect: Connecting to LDAP server: e752.squirrelcube.com try_tls=YES
 -- ldap_connect: Connecting to LDAP server: e752.squirrelcube.com try_tls=NO
SASL/GSSAPI authentication started
SASL username: gp.pfuetzenreuter@SQUIRRELCUBE.COM
SASL SSF: 56
SASL data security layer installed.
 -- ldap_connect: LDAP_OPT_X_SASL_SSF=56

 -- ldap_get_base_dn: Determining default LDAP base: dc=SQUIRRELCUBE,dc=COM
 -- ldap_check_account: Checking that a computer account for deprox-http$ exists
 -- ldap_check_account: Computer account not found, create the account

No computer account for deprox-http found, creating a new one.
dn: cn=deprox-http,ou=Server,dc=SQUIRRELCUBE,dc=COM
 -- ldap_check_account_strings: Inspecting (and updating) computer account attributes
 -- ldap_simple_set_attr: Calling ldap_modify_ext_s to set dNSHostName to deprox.squirrelcube.com
 -- ldap_simple_set_attr: Calling ldap_modify_ext_s to set userPrincipalName to HTTP/deprox.squirrelcube.com@SQUIRRELCUBE.COM
 -- ldap_set_supportedEncryptionTypes: DEE dn=cn=deprox-http,ou=Server,dc=SQUIRRELCUBE,dc=COM old=7 new=28

 -- ldap_simple_set_attr: Calling ldap_modify_ext_s to set msDs-supportedEncryptionTypes to 28
 -- ldap_set_userAccountControl_flag: Setting userAccountControl bit at 0x200000 to 0x0
 -- ldap_set_userAccountControl_flag:  userAccountControl not changed 0x1000

 -- set_password: Attempting to reset computer's password  
 -- set_password: Try change password using user's ticket cache  

 -- ldap_get_pwdLastSet: pwdLastSet is 130999411078213749
 -- set_password: Successfully set password, waiting for it to be reflected in LDAP.
 -- ldap_get_pwdLastSet: pwdLastSet is 130999411078682497
 -- set_password: Successfully reset computer's password  
 -- ldap_add_principal: Checking that adding principal HTTP/deprox.squirrelcube.com to deprox-http$ won't cause a conflict  
 -- ldap_add_principal: Adding principal HTTP/deprox.squirrelcube.com to LDAP entry
 -- ldap_add_principal: Checking that adding principal host/deprox.squirrelcube.com to deprox-http$ won't cause a conflict  
 -- ldap_add_principal: Adding principal host/deprox.squirrelcube.com to LDAP entry
 -- execute: Updating all entries for deprox.squirrelcube.com in the keytab WRFILE:/etc/squid3/PROXY.keytab

 -- update_keytab: Updating all entires for deprox-http$
 -- ldap_get_kvno: KVNO is 2
 -- add_principal_keytab: Adding principal to keytab: deprox-http$
 -- add_principal_keytab:     Using salt of SQUIRRELCUBE.COMhostdeprox-http.squirrelcube.com
 -- add_principal_keytab:   Adding entry of enctype 0x17
 -- add_principal_keytab:     Using salt of SQUIRRELCUBE.COMhostdeprox-http.squirrelcube.com
 -- add_principal_keytab:   Adding entry of enctype 0x11
 -- add_principal_keytab:     Using salt of SQUIRRELCUBE.COMhostdeprox-http.squirrelcube.com
 -- add_principal_keytab:   Adding entry of enctype 0x12
 -- add_principal_keytab: Adding principal to keytab: HTTP/deprox.squirrelcube.com
 -- add_principal_keytab: Removing entries with kvno < 0
 -- add_principal_keytab:     Using salt of SQUIRRELCUBE.COMhostdeprox-http.squirrelcube.com
 -- add_principal_keytab:   Adding entry of enctype 0x17
 -- add_principal_keytab:     Using salt of SQUIRRELCUBE.COMhostdeprox-http.squirrelcube.com
 -- add_principal_keytab:   Adding entry of enctype 0x11
 -- add_principal_keytab:     Using salt of SQUIRRELCUBE.COMhostdeprox-http.squirrelcube.com
 -- add_principal_keytab:   Adding entry of enctype 0x12
 -- add_principal_keytab: Adding principal to keytab: host/deprox.squirrelcube.com
 -- add_principal_keytab: Removing entries with kvno < 0
 -- add_principal_keytab:     Using salt of SQUIRRELCUBE.COMhostdeprox-http.squirrelcube.com
 -- add_principal_keytab:   Adding entry of enctype 0x17
 -- add_principal_keytab:     Using salt of SQUIRRELCUBE.COMhostdeprox-http.squirrelcube.com
 -- add_principal_keytab:   Adding entry of enctype 0x11
 -- add_principal_keytab:     Using salt of SQUIRRELCUBE.COMhostdeprox-http.squirrelcube.com
 -- add_principal_keytab:   Adding entry of enctype 0x12
 -- ~msktutil_exec: Destroying msktutil_exec
 -- ldap_cleanup: Disconnecting from LDAP server
 -- init_password: Wiping the computer password structure
 -- ~KRB5Context: Destroying Kerberos Context