Technical Tip: How to resolve 'Internal Server Error 500 when creating a Local User after deleting another User with LDAP Auto-Provisioning enabled

Description

The article describes how to resolve the 'Internal Server Error 500' error when creating a local user after deleting another user when LDAP service auto-provisioning is enabled. 

Scope

FortiAuthenticator v6.6.7.

Solution

In this scenario, when creating a new local user, the user receives 'Internal Server Error 500'.

GUI logs show the following error: 

File "/lib/python3.13/site-packages/django/contrib/auth/admin.py", line 147, in _add_view
    return super().add_view(request, form_url, extra_context)
           ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "./fac/fac/common/admin.py", line 276, in add_view
  File "./fac/fac/common/admin.py", line 98, in add_view
  File "/lib/python3.13/site-packages/django/contrib/admin/options.py", line 1886, in add_view
    return self.changeform_view(request, None, form_url, extra_context)
           ~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/lib/python3.13/site-packages/django/utils/decorators.py", line 46, in _wrapper
    return bound_method(*args, **kwargs)
  File "/lib/python3.13/site-packages/django/utils/decorators.py", line 134, in _wrapper_view
    response = view_func(request, *args, **kwargs)
  File "/lib/python3.13/site-packages/django/contrib/admin/options.py", line 1747, in changeform_view
    return self._changeform_view(request, object_id, form_url, extra_context)
           ~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/lib/python3.13/site-packages/django/contrib/admin/options.py", line 1805, in _changeform_view
    return self.response_add(request, new_object)
           ~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^
  File "./fac/fac/apps/local_user/admin/auth_user.py", line 384, in response_add
  File "./fac/fac/apps/fac_auth/utils.py", line 1386, in map_local_user_to_fac_ldap
ValueError: too many values to unpack (expected 2)

The issue occurs when the following option is enabled: LDAP Tree Menu -> General -> LDAP User Auto Provisioning -> Auto provision users into LDAP from the following sources -> GUI (Manually created local users).

This behaviour is tracked as a known issue (ID 1205032) in v6.6.7.

As a workaround, disable Auto-provision users into LDAP from the following sources: GUI (Manually created local users) to resolve the error in v6.6.7.

However, the known issue has been fixed in FortiAuthenticator v6.6.8.