Disallow passthroughs on nodes and remote servers as well.

src/stratifier.c

@@ -6465,8 +6465,8 @@ static void parse_method(ckpool_t *ckp, sdata_t *sdata, stratum_instance_t *clie
 	if (unlikely(cmdmatch(method, "mining.passthrough"))) {
 		char buf[256];
 
-		if (ckp->proxy) {
-			LOGNOTICE("Dropping client %s %s trying to connect as passthrough on proxy server %d",
+		if (ckp->proxy || ckp->node || ckp->remote) {
+			LOGNOTICE("Dropping client %s %s trying to connect as passthrough on unsupported server %d",
 				  client->identity, client->address, client->server);
 			connector_drop_client(ckp, client_id);
 			drop_client(ckp, sdata, client_id);