I'm trying to configure ad trust on a freshly installed FreeIPA server 4.4.0 
running on an up-to-date instance of CentOS 7 (1611). The ipa-adtrust-install 
command fails at step 17 (failed to add fallback group). As a consequence, 
Samba cannot be started and AD trusts can't be established.

Here is an excerpt of the install log:

# ipa-adtrust-install --netbios-name=PEP06-IPA --add-sids --enable-compat


2017-06-01T13:49:29Z DEBUG   [18/23]: adding fallback group
2017-06-01T13:49:29Z DEBUG flushing 
ldapi://%2fvar%2frun%2fslapd-IPA-PEP06-FR.socket from SchemaCache
2017-06-01T13:49:29Z DEBUG retrieving schema for SchemaCache 
conn=<ldap.ldapobject.SimpleLDAPObject instance at 0x62107a0>
2017-06-01T13:49:30Z DEBUG Starting external process
2017-06-01T13:49:30Z DEBUG args=/usr/bin/ldapmodify -v -f /tmp/tmpyj5xIJ -H 
ldapi://%2fvar%2frun%2fslapd-IPA-PEP06-FR.socket -Y EXTERNAL
2017-06-01T13:49:30Z DEBUG Process finished, return code=1
2017-06-01T13:49:30Z DEBUG stdout=add cn:
        Default SMB Group
add description:
        Fallback group for primary group RID, do not add users to this group
add gidnumber:
add objectclass:
adding new entry "cn=Default SMB 

2017-06-01T13:49:30Z DEBUG stderr=ldap_initialize( 
ldapi://%2Fvar%2Frun%2Fslapd-IPA-PEP06-FR.socket/??base )
SASL/EXTERNAL authentication started
SASL username: gidNumber=0+uidNumber=0,cn=peercred,cn=external,cn=auth
ldap_add: Operations error (1)
        additional info: Allocation of a new value for range cn=posix 
ids,cn=distributed numeric assignment plugin,cn=plugins,cn=config failed! 
Unable to proceed.

2017-06-01T13:49:30Z CRITICAL Failed to load default-smb-group.ldif: Command 
'/usr/bin/ldapmodify -v -f /tmp/tmpyj5xIJ -H 
ldapi://%2fvar%2frun%2fslapd-IPA-PEP06-FR.socket -Y EXTERNAL' returned non-zero 
exit status 1
2017-06-01T13:49:30Z DEBUG Failed to add fallback group.
2017-06-01T13:49:30Z DEBUG   duration: 0 seconds



In the end, Samba logically fails to start with the following error:

Missing mandatory attribute ipaNTFallbackPrimaryGroup.


I ran the same command one week ago on another server and had no issue.
Does anybody have an idea about what to do to make it work ?


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