Index: modules/univention/connector/ad/__init__.py
===================================================================
--- modules/univention/connector/ad/__init__.py	(Revision 37358)
+++ modules/univention/connector/ad/__init__.py	(Arbeitskopie)
@@ -2086,7 +2086,12 @@
 							else:
 								modlist.append((ldap.MOD_DELETE, attr, None))
 
-			self.lo_ad.lo.add_s(compatible_modstring(object['dn']), compatible_addlist(addlist)) #FIXME encoding
+			try:
+				self.lo_ad.lo.add_s(compatible_modstring(object['dn']), compatible_addlist(addlist)) #FIXME encoding
+			except:
+				ud.debug(ud.LDAP, ud.ERROR, "sync_from_ucs: traceback during add object: %s"%object['dn'])
+				ud.debug(ud.LDAP, ud.ERROR, "sync_from_ucs: traceback due to addlist: %s"%addlist)
+				raise
 
 			if property_type == 'group':
 				self.group_members_cache_con[object['dn'].lower()] = []
@@ -2176,7 +2181,12 @@
 						modlist.append((ldap.MOD_DELETE, yank_empty_attr, None))
 
 			if modlist:
-				self.lo_ad.lo.modify_s(compatible_modstring(object['dn']), compatible_modlist(modlist))
+				try:
+					self.lo_ad.lo.modify_s(compatible_modstring(object['dn']), compatible_modlist(modlist))
+				except:
+					ud.debug(ud.LDAP, ud.ERROR, "sync_from_ucs: traceback during modify object: %s"%object['dn'])
+					ud.debug(ud.LDAP, ud.ERROR, "sync_from_ucs: traceback due to modlist: %s"%modlist)
+					raise
 
 
 			if hasattr(self.property[property_type],"post_con_modify_functions"):