--- a/management/univention-directory-manager-modules/modules/univention/admin/uldap.py	
+++ a/management/univention-directory-manager-modules/modules/univention/admin/uldap.py	
@@ -251,6 +251,8 @@ def __init__(self, host='localhost', port=None, base='', binddn='', bindpw='', s
 		self.licensetypes = ['UCS']
 
 	def bind(self, binddn, bindpw):
+		self.binddn = binddn
+		self.bindpw = bindpw
 		try:
 			self.lo.bind(binddn, bindpw)
 		except ldap.INVALID_CREDENTIALS: