--- a/src/pyams_ldap/plugin.py	Thu Nov 08 15:25:19 2018 +0100
+++ b/src/pyams_ldap/plugin.py	Thu Nov 08 15:25:54 2018 +0100
@@ -41,11 +41,12 @@
 class ConnectionManager(object):
     """LDAP connections manager"""
 
+    _connection = None
+
     def __init__(self, plugin):
         self.server = ldap3.Server(plugin.host,
                                    port=plugin.port,
-                                   use_ssl=plugin.use_ssl,
-                                   tls=plugin.use_tls)
+                                   use_ssl=plugin.use_ssl)
         self.bind_dn = plugin.bind_dn
         self.password = plugin.bind_password
 
@@ -54,18 +55,22 @@
             conn = ldap3.Connection(self.server,
                                     user=user, password=password,
                                     client_strategy=ldap3.ASYNC,
-                                    auto_bind=ldap3.AUTO_BIND_DEFAULT,
-                                    lazy=True,
+                                    auto_bind=True,
+                                    lazy=False,
                                     read_only=read_only)
         else:
-            conn = ldap3.Connection(self.server,
-                                    user=self.bind_dn, password=self.password,
-                                    client_strategy=ldap3.REUSABLE,
-                                    auto_bind=ldap3.AUTO_BIND_DEFAULT if self.bind_dn else ldap3.AUTO_BIND_NONE,
-                                    lazy=True,
-                                    read_only=read_only)
-            if conn.auto_bind == ldap3.AUTO_BIND_NONE:
-                conn.open(read_server_info=False)
+            conn = self._connection
+            if conn is None:
+                bind_mode = ldap3.AUTO_BIND_DEFAULT if self.bind_dn else ldap3.AUTO_BIND_NONE
+                conn = ldap3.Connection(self.server,
+                                        user=self.bind_dn, password=self.password,
+                                        client_strategy=ldap3.REUSABLE,
+                                        auto_bind=bind_mode,
+                                        lazy=True,
+                                        read_only=read_only)
+                if conn.auto_bind == ldap3.AUTO_BIND_NONE:
+                    conn.open(read_server_info=False)
+                self._connection = conn
         return conn
 
 
@@ -166,7 +171,6 @@
     _use_ssl = False
 
     _server_uri = FieldProperty(ILDAPPlugin['server_uri'])
-    use_tls = FieldProperty(ILDAPPlugin['use_tls'])
     bind_dn = FieldProperty(ILDAPPlugin['bind_dn'])
     bind_password = FieldProperty(ILDAPPlugin['bind_password'])
 
@@ -251,7 +255,10 @@
         self_id = self._get_id()
         if self_id not in managers:
             managers[self_id] = ConnectionManager(self)
-        return managers[self_id].get_connection(user, password)
+        connection = managers[self_id].get_connection(user, password)
+        if connection.closed:
+            connection.open(read_server_info=False)
+        return connection
 
     def authenticate(self, credentials, request):
         if not self.enabled: