diff --git a/source3/smbd/service.c b/source3/smbd/service.c
index f4f6e9a..15f4b6e 100644
--- a/source3/smbd/service.c
+++ b/source3/smbd/service.c
@@ -484,6 +484,8 @@ NTSTATUS set_conn_force_user_group(connection_struct *conn, int snum)
 			guest,
 			&forced_serverinfo);
 		if (!NT_STATUS_IS_OK(status)) {
+			DEBUG(0,("force user for user %s failed with %s\n",
+				fuser, nt_errstr(status)));
 			return status;
 		}
 
@@ -507,6 +509,9 @@ NTSTATUS set_conn_force_user_group(connection_struct *conn, int snum)
 			&conn->session_info->unix_token->gid);
 
 		if (!NT_STATUS_IS_OK(status)) {
+			DEBUG(0,("force group for group %s failed with %s\n",
+				*lp_force_group(snum),
+				nt_errstr(status)));
 			return status;
 		}