diff --git a/management/univention-management-console/src/univention/management/console/auth.py b/management/univention-management-console/src/univention/management/console/auth.py
index ec6ee93..1f4843e 100644
--- a/management/univention-management-console/src/univention/management/console/auth.py
+++ b/management/univention-management-console/src/univention/management/console/auth.py
@@ -42,8 +42,8 @@
 import notifier.signals as signals
 import notifier.threads as threads
 
-from univention.uldap import getMachineConnection
 from univention.management.console.log import AUTH
+from univention.management.console.ldap import get_machine_connection
 from univention.management.console.pam import PamAuth, AuthenticationError, AuthenticationFailed, AuthenticationInformationMissing, PasswordExpired, AccountExpired, PasswordChangeFailed
 
 
@@ -127,7 +127,7 @@ def __authenticate_thread(self, username, password, new_password, **custom_promp
 
 	def __canonicalize_username(self, username):
 		try:
-			lo = getMachineConnection()
+			lo, po = get_machine_connection(write=False)
 			attr = 'mailPrimaryAddress' if '@' in username else 'uid'
 			result = lo.search('%s=%s' % (attr, escape_filter_chars(username)), attr=['uid'], unique=True)
 			if result and result[0][1].get('uid'):