diff -r -U 7 samba-3.5.6.orig/source3/winbindd/winbindd_lookuprids.c samba-3.5.6/source3/winbindd/winbindd_lookuprids.c
--- samba-3.5.6.orig/source3/winbindd/winbindd_lookuprids.c	2010-10-07 19:41:16.000000000 +0300
+++ samba-3.5.6/source3/winbindd/winbindd_lookuprids.c	2010-11-29 10:57:07.319026719 +0200
@@ -64,14 +64,15 @@
 	domain = find_domain_from_sid_noinit(&sid);
 	if (domain == NULL) {
 		DEBUG(5, ("Domain for sid %s not found\n",
 			  sid_string_dbg(&sid)));
 		tevent_req_nterror(req, NT_STATUS_NO_SUCH_DOMAIN);
 		return tevent_req_post(req, ev);
 	}
+	state->domain_name = domain->name;
 
 	if (request->extra_data.data[request->extra_len-1] != '\0') {
 		DEBUG(5, ("extra_data not 0-terminated\n"));
 		tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
 		return tevent_req_post(req, ev);
 	}