diff -Naur samba-4.11.0/source3/winbindd/winbindd_getgroups.c samba-4.11.0-fix-winbind_empty_domain/source3/winbindd/winbindd_getgroups.c
--- samba-4.11.0/source3/winbindd/winbindd_getgroups.c	2019-02-21 07:53:38.368548591 -0500
+++ samba-4.11.0-fix-winbind_empty_domain/source3/winbindd/winbindd_getgroups.c	2019-03-01 18:53:02.504448617 -0500
@@ -85,6 +85,12 @@
 		return tevent_req_post(req, ev);
 	}
 
+        /* if no domain but local domain, set domain to get_global_sam_name */
+
+        if ( !*(state->domname) && *(state->namespace) ) {
+                fstrcpy(state->domname, get_global_sam_name());
+        }
+
 	subreq = wb_lookupname_send(state, ev,
 				    state->namespace,
 				    state->domname,
diff -Naur samba-4.11.0/source3/winbindd/winbindd_getpwnam.c samba-4.11.0-fix-winbind_empty_domain/source3/winbindd/winbindd_getpwnam.c
--- samba-4.11.0/source3/winbindd/winbindd_getpwnam.c	2019-02-21 07:53:38.368548591 -0500
+++ samba-4.11.0-fix-winbind_empty_domain/source3/winbindd/winbindd_getpwnam.c	2019-03-01 18:54:12.342883881 -0500
@@ -81,6 +81,12 @@
 		return tevent_req_post(req, ev);
 	}
 
+        /* if no domain but local domain, set domain to get_global_sam_name */
+
+        if ( !*(state->domname) && *(state->namespace) ) {
+                fstrcpy(state->domname, get_global_sam_name());
+        }
+
 	subreq = wb_lookupname_send(state, ev,
 				    state->namespace,
 				    state->domname,