Index: modules/univention/s4connector/s4/dns.py
===================================================================
--- modules/univention/s4connector/s4/dns.py	(Revision 77820)
+++ modules/univention/s4connector/s4/dns.py	(Arbeitskopie)
@@ -1499,7 +1502,13 @@
 
 	if object.get('attributes'):
 		oc = object['attributes'].get('objectClass')
-		dc = object['attributes'].get('dc')
+		try:
+			dc_vals = [value for key, value in object['attributes'].iteritems() if 'dc' == key.lower()][0]
+		except IndexError:
+			dc = None
+		else:
+			dc = dc_vals[0]
+
 		if oc and 'dnsZone' in oc:
 			# forward or reverse zone
 			if dc and dc[0].endswith('in-addr.arpa'):