diff -r bf589bc39592 -r 0cde6357775d src/pyams_ldap/zmi/plugin.py
--- a/src/pyams_ldap/zmi/plugin.py	Fri Apr 27 10:36:33 2018 +0200
+++ b/src/pyams_ldap/zmi/plugin.py	Mon Nov 05 16:34:09 2018 +0100
@@ -12,48 +12,44 @@
 
 __docformat__ = 'restructuredtext'
 
-
-# import standard library
 import base64
-import ldap3
 
-# import interfaces
+import ldap3
+from pyramid.view import view_config
+from z3c.form import field
+from z3c.form.interfaces import DISPLAY_MODE
+from z3c.table.column import GetAttrColumn
+from z3c.table.interfaces import IColumn
+from zope.component.interfaces import ISite
+from zope.interface import Interface, implementer
+
+from pyams_form.form import AJAXAddForm, AJAXEditForm
 from pyams_form.interfaces.form import IInnerTabForm, IWidgetsSuffixViewletsManager
+from pyams_form.search import SearchResultsView, SearchView
 from pyams_ldap.interfaces import ILDAPPlugin
-from pyams_security.interfaces import ISecurityManager, IPlugin
+from pyams_ldap.plugin import LDAPPlugin
+from pyams_ldap.query import LDAPQuery
+from pyams_pagelet.pagelet import pagelet_config
+from pyams_security.interfaces import IPlugin, ISecurityManager
+from pyams_security.zmi.utility import SecurityManagerPluginsTable
 from pyams_skin.interfaces import IPageHeader
 from pyams_skin.interfaces.viewlet import IToolbarAddingMenu
 from pyams_skin.layer import IPyAMSLayer
-from pyams_utils.interfaces import VIEW_SYSTEM_PERMISSION, MANAGE_SECURITY_PERMISSION
-from pyams_zmi.interfaces import IAdminView
-from pyams_zmi.layer import IAdminLayer
-from z3c.form.interfaces import DISPLAY_MODE
-from z3c.table.interfaces import IColumn
-from zope.component.interfaces import ISite
-
-# import packages
-from pyams_form.form import AJAXAddForm, AJAXEditForm
-from pyams_form.search import SearchView, SearchResultsView
-from pyams_ldap.plugin import LDAPPlugin
-from pyams_ldap.query import LDAPQuery
-from pyams_pagelet.pagelet import pagelet_config
-from pyams_security.zmi.utility import SecurityManagerPluginsTable
 from pyams_skin.page import DefaultPageHeaderAdapter
 from pyams_skin.skin import apply_skin
 from pyams_skin.table import I18nColumn
 from pyams_skin.viewlet.toolbar import ToolbarMenuItem
 from pyams_template.template import template_config
 from pyams_utils.adapter import adapter_config
+from pyams_utils.interfaces import MANAGE_SECURITY_PERMISSION, VIEW_SYSTEM_PERMISSION
 from pyams_utils.registry import query_utility
 from pyams_utils.url import absolute_url
-from pyams_viewlet.viewlet import viewlet_config, Viewlet
-from pyams_zmi.form import AdminDialogAddForm, AdminDialogEditForm, AdminDialogDisplayForm, InnerAdminAddForm, \
+from pyams_viewlet.viewlet import Viewlet, viewlet_config
+from pyams_zmi.form import AdminDialogAddForm, AdminDialogDisplayForm, AdminDialogEditForm, InnerAdminAddForm, \
     InnerAdminEditForm
+from pyams_zmi.interfaces import IAdminView
+from pyams_zmi.layer import IAdminLayer
 from pyams_zmi.view import AdminView
-from pyramid.view import view_config
-from z3c.form import field
-from z3c.table.column import GetAttrColumn
-from zope.interface import implementer, Interface
 
 from pyams_ldap import _
 
@@ -125,8 +121,7 @@
 
     tab_label = _("Connection")
     legend = None
-    fields = field.Fields(ILDAPPlugin).select('server_uri', 'bind_dn', 'bind_password', 'use_tls',
-                                              'use_pool', 'pool_size', 'pool_lifetime')
+    fields = field.Fields(ILDAPPlugin).select('server_uri', 'use_tls', 'bind_dn', 'bind_password')
     weight = 1
 
 
@@ -237,8 +232,7 @@
 
     tab_label = _("Connection")
     legend = None
-    fields = field.Fields(ILDAPPlugin).select('server_uri', 'bind_dn', 'bind_password', 'use_tls',
-                                              'use_pool', 'pool_size', 'pool_lifetime')
+    fields = field.Fields(ILDAPPlugin).select('server_uri', 'use_tls', 'bind_dn', 'bind_password')
     edit_permission = MANAGE_SECURITY_PERMISSION
 
     weight = 1
@@ -422,6 +416,6 @@
         dn, attributes = result[0]
         if 'jpegPhoto' in attributes:
             attributes['jpegPhoto'] = ['<img src="data:image/jpeg;base64,{0}" />'.
-                                       format(base64.encodebytes(attributes['jpegPhoto'][0]).decode()), ]
+                                           format(base64.encodebytes(attributes['jpegPhoto'][0]).decode()), ]
         result = sorted(attributes.items(), key=lambda x: x[0])
         return result