Problem:LDAP implementation specific error - DN index delete failed or index generation failed

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#1

Problem

If you are having problems modifying or synchronizing users, and you see the following tracebacks in the log file.


Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/univention/connector/__init__.py", line 1399, in sync_to_ucs
    result = self.delete_in_ucs(property_type, object, module, position)
  File "/usr/lib/python3/dist-packages/univention/connector/__init__.py", line 1255, in delete_in_ucs
    ucs_object.remove()
  File "/usr/lib/python3/dist-packages/univention/admin/handlers/__init__.py", line 884, in remove
    return self._remove(remove_childs)
  File "/usr/lib/python3/dist-packages/univention/admin/handlers/__init__.py", line 1575, in _remove
    self.lo.delete(self.dn)
  File "/usr/lib/python3/dist-packages/univention/admin/uldap.py", line 875, in delete
    raise univention.admin.uexceptions.ldapError(_err2str(msg), original_exception=msg)
univention.admin.uexceptions.ldapError: LDAP Error: Other (e.g., implementation specific) error: DN index delete failed.

or

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/univention/connector/__init__.py", line 1391, in sync_to_ucs
    result = self.add_in_ucs(property_type, object, module, position)
  File "/usr/lib/python3/dist-packages/univention/connector/__init__.py", line 1163, in add_in_ucs
    res = ucs_object.create(serverctrls=serverctrls, response=response)
  File "/usr/lib/python3/dist-packages/univention/admin/handlers/__init__.py", line 554, in create
    self._ldap_pre_ready()
  File "/usr/lib/python3/dist-packages/univention/admin/handlers/users/user.py", line 1484, in _ldap_pre_ready
    self.request_lock('uid', self['username'])
  File "/usr/lib/python3/dist-packages/univention/admin/handlers/__init__.py", line 1712, in request_lock
    value = univention.admin.allocators.request(self.lo, self.position, name, value)
  File "/usr/lib/python3/dist-packages/univention/admin/allocators.py", line 220, in request
    return acquireUnique(lo, position, type, value, _type2attr[type], scope=_type2scope[type])
  File "/usr/lib/python3/dist-packages/univention/admin/allocators.py", line 178, in acquireUnique
    univention.admin.locking.lock(lo, position, type, value.encode('utf-8'), scope=scope)
  File "/usr/lib/python3/dist-packages/univention/admin/locking.py", line 97, in lock
    lo.add(dn, al)
  File "/usr/lib/python3/dist-packages/univention/admin/uldap.py", line 772, in add
    raise univention.admin.uexceptions.ldapError(_err2str(msg), original_exception=msg)
univention.admin.uexceptions.ldapError: LDAP Error: Other (e.g., implementation specific) error: index generation failed

Then it looks like the LDAP database has an issue.

Solution

Restore the database using the following instructions:

#2
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