Index: samba-3.0.25c/source/nsswitch/idmap_ad.c
===================================================================
--- samba-3.0.25c.orig/source/nsswitch/idmap_ad.c	2007-09-04 13:50:33.000000000 -0500
+++ samba-3.0.25c/source/nsswitch/idmap_ad.c	2007-09-04 13:51:36.000000000 -0500
@@ -753,7 +753,7 @@
        
 	if ( gid ) {		
 		if ( !ads_pull_uint32(ads, msg, ad_schema->posix_gidnumber_attr, gid ) )
-			*gid = 0;		
+			*gid = (uint32)-1;		
 	}
 		
 	return NT_STATUS_OK;