Index: source3/winbindd/winbindd_cm.c
===================================================================
--- source3/winbindd/winbindd_cm.c.orig
+++ source3/winbindd/winbindd_cm.c
@@ -2202,7 +2202,11 @@ NTSTATUS cm_connect_lsa_tcp(struct winbi
 	    conn->lsa_pipe_tcp->transport->transport == NCACN_IP_TCP &&
 	    conn->lsa_pipe_tcp->auth->auth_level == PIPE_AUTH_LEVEL_PRIVACY &&
  	    rpc_pipe_tcp_connection_ok(conn->lsa_pipe_tcp)) {
-		goto done;
+		status =  rpccli_lsa_TestCall(conn->lsa_pipe_tcp, mem_ctx);
+		if (NT_STATUS_IS_OK(status)) {
+			goto done;
+		}
+		DEBUG(5, ("Connection is not valid anymore, reconnecting\n"));
 	}
 
 	TALLOC_FREE(conn->lsa_pipe_tcp);